Showing papers on "Aluminium hydroxide published in 1987"
TL;DR: The role of glutamic and aspartic acids in affecting the adsorption of copper (II) onto aluminium hydroxide from aqueous solution has been studied by means of analytical and spectroscopic (ESR and reflectance absorption) measurements as discussed by the authors.
25 citations
Patent•
28 Aug 1987
TL;DR: In this article, a high-strength, fire-resistant composition containing calcium sulphate hemihydrate, a boron compound having fire resistant properties including boric acid, anhydrous boric acids, sodium tetraborate decahydrate (borax) and sodium borate an hydrous, and aluminium and/or silicon compound including aluminium hydroxide, aluminium oxide and sodium aluminate and sodium silicate, silicon dioxide, silica gel and silicic acid, natural or synthetic fibres and water.
Abstract: A high-strength, fire-resistant composition containing calcium sulphate hemihydrate, a boron compound having fire-resistant properties including boric acid, anhydrous boric acid, sodium tetraborate decahydrate (borax) and sodium borate anhydrous, and aluminium and/or silicon compound including aluminium hydroxide, aluminium oxide and sodium aluminate and sodium silicate, silicon dioxide, silica gel and silicic acid, natural or synthetic fibres and water. Such compositions can be used in building materials such as wallboard, thermal insulation, fire breaks and soundproofing panels. More particularly the composition has greater strength and fire-resistance when compared to standard gypsum wallboard and fire related gypsum wallboard. The application of this composition in slurry form and the use of this composition for use in finishing joints between wallboard are also contemplated.
24 citations
TL;DR: In this article, the aluminium hydroxide formation at 37 °C in aqueous NaCl (0.15 mol dm-3) has been investigated and the following species have been characterized: [Al(OH)]2+, Al(OH)3, [Al[Al[OH]4], Al[Al]5], [Al6]15]3+, and [Al8(OH]22]2+.
Abstract: Aluminium is prone to hydrolyse within a large range of physiological pH. Although this phenomenon has drawn much attention in the recent past, no reliable hydroxide formation constants have been produced so far that can be applied to physiological conditions of ionic strength and temperature. Prior to future aluminium–ligand equilibrium studies, aluminium hydroxide formation at 37 °C in aqueous NaCl (0.15 mol dm–3) has been investigated. The following species have been characterized: [Al(OH)]2+, Al(OH)3, [Al(OH)4]–, [Al3(OH)11]2–, [Al6(OH)15]3+, and [Al8(OH)22]2+.
24 citations
TL;DR: Two patients with extensive tumoral calcinosis were treated with aluminium hydroxide and both subjects developed hypercalciuria and there was dissolution of many of the calcific tumours.
Abstract: Two patients with extensive tumoral calcinosis were treated with aluminium hydroxide. Initial metabolic studies showed positive calcium and phosphorus balances which became negative with aluminium hydroxide treatment. One subject, who had renal impairment, developed transient hypercalcaemia, parathyroid suppression, low levels of 1,25-dihydroxyvitamin D and calcium malabsorption during treatment with aluminium hydroxide. The second patient developed calcium malabsorption due to vitamin D deficiency. When she was replete with vitamin D there were supranormal levels of 1,25-(OH)2D in the serum and enhanced calcium absorption during treatment with aluminium hydroxide. Both subjects developed hypercalciuria and there was dissolution of many of the calcific tumours. The patient with renal impairment accumulated aluminium in the bone.
21 citations
TL;DR: In this article, a novel adsorbent for the determination of the toxic fraction of copper in natural waters is described, which is based on a sulfonic acid cation-exchange resin.
21 citations
TL;DR: Dietary administration of up to 30,000 ppm of either of the basic sodium aluminium phosphate formulations caused neither toxicity nor significant deposition of aluminium in femur, as well as no treatment-related changes were observed at autopsy or in histopathological examination of collected tissues.
19 citations
Patent•
18 May 1987
TL;DR: In this article, an aluminosilicate vida leached water-soluble residue obtained from the reaction of the aluminosity with hydrated calcium and/or magnesium chloride, with or without a minor proportion of sodium chloride, is treated, preferably with the application of heat, with a mineral acid such as hydrochloric acid which forms a watersoluble aluminium salt, this can be diluted with water to produce an aqueous solution of the aluminium salt and an insoluble residue comprising hydrated silica.
Abstract: Alumina is recovered from an aluminosilicate vida leached water-soluble residue obtained from the reaction of the aluminosilicate with hydrated calcium and/or magnesium chloride, with or without a minor proportion of sodium chloride, the leached residue is treated, preferably with the application of heat, with a mineral acid such as hydrochloric acid which forms a water-soluble aluminium salt, this can be diluted with water to produce an aqueous solution of the aluminium salt and an insoluble residue comprising hydrated silica, the aluminium salt solution being separated from the insoluble residue and the aluminium hydroxide, alumina thereafter being recovered from the aluminium salt solution, for example by evaporation or by treatment with alkaline metal hydroxide or ammonium hydroxide.
13 citations
TL;DR: Results show the effectiveness of magnesium carbonate oral phosphate-binding agents and zero magnesium dialysate in reducing serum aluminium without affecting the behaviour of serum calcium fractions during dialysis.
Abstract: The effect of oral magnesium carbonate or aluminium hydroxide on serum ionised calcium, total calcium, aluminium and magnesium, was assessed in 31 patients with chronic renal failure, during and after one haemodialysis. The behaviour of ionised calcium and total calcium was the same in both groups. Each showed a slight fall during dialysis, which was not significant. Serum total calcium was 0.2-0.3 mmol/l (0.8-1.2 mg/dl) greater throughout the period of dialysis in the group taking aluminium hydroxide. Serum magnesium and aluminium were both lower in the group treated with magnesium carbonate. In the group taking magnesium carbonate, serum magnesium concentrations fell markedly during dialysis, but otherwise were maintained within the reference range by the use of a magnesium-free dialysate. These results show the effectiveness of magnesium carbonate oral phosphate-binding agents and zero magnesium dialysate in reducing serum aluminium without affecting the behaviour of serum calcium fractions during dialysis.
11 citations
Journal Article•
TL;DR: With the exception of possible metabolic effects occurring on a long term basis, Mg(OH)2 in association with magnesium-free dialysate seems of value to treat dialysis hyperphosphatemia.
Abstract: The control of hyperphosphatemia in dialysis patients is frequently achieved using aluminium hydroxide (A1(OH)3) and/or calcium carbonate (Ca CO3). However, this effect is counterbalanced by risk of aluminium intoxication and hypercalcemia. An alternative to the use of these phosphate binders is the prescription of magnesium hydroxide (Mg(OH)2) in association with a magnesium free dialysate. 19 patients with subtoxic plasma aluminium concentration received such a therapy. 9 months after starting the essay 4 patients had been excluded for digestive intolerance (3 cases) and neuro-psychic symptoms related to hypermagnesemia (1 case) after therapy with maximal doses of 6 to 12 g/d. Plasma inorganic phosphorus was decreased from 2.47 +/- 0.32 to 1.86 +/- 0.40 mmol/l (P less than 0.05) and plasma aluminium from 3.03 +/- 0.93 to 1.52 +/- 0.15 mumol/l (P less than 0.05). The results have been obtained without any significant increase in plasma and red cell magnesium levels. Metabolic alkalosis has been observed in association with the increase of ion exchange resin (sodium polystyrene sulfonate: Kayexalate) to treat progressive hyperkalemia. With the exception of possible metabolic effects occurring on a long term basis, Mg(OH)2 in association with magnesium-free dialysate seems of value to treat dialysis hyperphosphatemia.
10 citations
Patent•
09 Sep 1987
TL;DR: The ratio of aluminium hydroxide (expressed as equivalent aluminium oxide) to ibuprofen may be in the range 1:50 to 5:1 parts by weight.
Abstract: A pharmaceutical composition for oral administration comprising a mixture of ibuprofen or a pharmaceutically acceptable salt thereof and aluminium hydroxide, the amount of aluminium hydroxide being sufficient to mask the bitter taste of the ibuprofen, or the salt thereof which would be evident in the absence of aluminium hydroxide. The ratio of aluminium hydroxide (expressed as equivalent aluminium oxide) to ibuprofen may be in the range 1:50 to 5:1 parts by weight.
10 citations
TL;DR: In this article, the effect of coadministration of ketoprofen and aluminium hydroxide on the bioavailability of keprofen was investigated in healthy volunteers, where urine was collected for 24 hours following drug administration and samples were analyzed by HPLC for ketopprofen and its conjugates.
TL;DR: In this article, NMR and relaxation measurements on thermally treated zeolite Na 3.2 Ca 4.4 -A have been carried out in order to study framework defects responsible for, and surface barriers to, molecular diffusion.
Patent•
10 Aug 1987
TL;DR: The paste contains: 1. - 3 vinyl diorganopolysiloxanes including one gum and two oils of differing viscosity, 2. - an organohydrogen-polysiloxane, 3. - a platinum-based catalyst, 4. - filler chosen from alumina and aluminium hydroxide, 5. - plasticiser as mentioned in this paper.
Abstract: The paste contains: 1. - 3 vinyl diorganopolysiloxanes including one gum and two oils of differing viscosity, 2. - an organohydrogenopolysiloxane, 3. - a platinum-based catalyst, 4. - a filler chosen from alumina and aluminium hydroxide, 5. - a plasticiser.
TL;DR: It is suggested that the routine use of aluminium hydroxide should be avoided in patients with compromised renal function and a significant proportion of patients in intensive care have, or are at risk of developing, renal failure.
Abstract: Prophylactic antacid therapy is widely used in intensive care units. We show that significant hyperaluminaemia may occur during the course of prophylaxis with aluminium hydroxide in patients with compromised renal function. Since a significant proportion of patients in intensive care have, or are at risk of developing, renal failure we suggest that the routine use of aluminium hydroxide should be avoided.
TL;DR: Release of PGE2 by low doses of antacid implies the possibility that enhanced cytoprotection may be involved in the mechanism by which antacids promote the healing of peptic ulcers.
Abstract: Suspensions of aluminium hydroxide or a commercial antacid containing aluminium hydroxide (Trigastril) was instilled intragastrically in rats in doses comparable to high and low human therapeutic doses (aluminium hydroxide, 125 mg and 12.5 mg/kg, respectively). Corresponding experiments were carried out with 0.6% citric acid added to the antacid suspensions. Prostaglandin E2 (PGE2) in the gastric content was analysed by radioimmunoassay 6 h after drug administration. Both high and low doses of aluminium hydroxide and Trigastril increased the concentration of PGE2 significantly. Citric acid did not significantly affect the antacid-induced PGE2 release except in combination with a low dose of aluminium hydroxide, with which a significant increase was seen. Release of PGE2 by low doses of antacids implies the possibility that enhanced cytoprotection may be involved in the mechanism by which antacids promote the healing of peptic ulcers.
Patent•
30 Sep 1987
TL;DR: The ratio of aluminium hydroxide (expressed as equivalent aluminium oxide) to ibuprofen may be in the range 1:50 to 5:1 parts by weight as discussed by the authors.
Abstract: A pharmaceutical composition for oral administration comprising a mixture of ibuprofen or a pharmaceutically acceptable salt thereof and aluminium hydroxide, the amount of aluminium hydroxide being sufficient to mask the bitter taste of the ibuprofen, or the salt thereof which would be evident in the absence of aluminium hydroxide. The ratio of aluminium hydroxide (expressed as equivalent aluminium oxide) to ibuprofen may be in the range 1:50 to 5:1 parts by weight.
TL;DR: The effect of temperature on the corrosion inhibition of low carbon steel in 31.3 g l −1 NaCl solution has been investigated in this paper, where a mixture of aluminium sulfate and thiourea (A + T) was found to be an effective corrosion inhibitor at temperatures 60°C.
Patent•
15 May 1987
TL;DR: In this article, the surface of a semiconductor in the stage before resin sealing process is sprayed with high temperature pure water containing non- ionized oxide or water solution of aluminium hydroxide not containing ionized impurity.
Abstract: PURPOSE:To form a plastic package type semiconductor structure with excellent humidity resistance while extending the corrosion resistance life of Al interconnection material by a method wherein the surface of Al and the surface of metallic material near the former surface are formed into complicated shapes to deposit aluminium hydroxide containing less ionized impurity on the surfaces simultaneously to be sealed with high purity resin material containing less ionized impurity. CONSTITUTION:The Al surface in direct contact with a resin is provided with numerous fine recessions or partially sticked on a water repellent material. Thus any permeating solution is coagulated in the cavities between the surface and the interface of resin to be electrically scattered. Next the surface of a semiconductor in the stage before resin sealing process is sprayed with high temperature pure water containing non- ionized oxide or water solution of aluminium hydroxide not containing ionized impurity. Then aluminium hydroxide films are deposited on the surface of Al member by repeating the drying up process of semiconductor. Through these procedures, the applicable resin contains a bit of ionized impurity subject to the extracted solution composition of sealing resin extracting 10g of resin powder at 60 deg.X1,000hr in 90ml of pure water and the electric conductivity +Br<-10ppm.
TL;DR: In this article, the crystal lochemical behavior of chromium and molybdenum was studied in the case of alumina and showed that the defects annihilated and contributed to densification (98%th) with an increase in temperature to 1600°C.
Abstract: Chromium and molybdenum were introduced into alumina through gel synthesis. Both elements are soluble in aluminium hydroxide and low-temperature (<1400°C) aluminium oxide. In the course of transformation from hydroxide to oxide, the evaporation-condensation of vapour phase (below 1000° C) causes shrinkage of the porous compact due to particle rearrangement and growth through capillary drag and adsorption. Subsequently, differences in agglomerate structure, grain growth, solute atmosphere and densification arise because of variations in the crystal lochemical behaviour of chromium and molybdenum. The solute atmospheres of chromia-vacancy and molybdenum metal reveal sub-grain boundaries and dislocations. In chromia-alumina solid solution these defects annihilate and contribute to densification (98%th) with increase in temperature to 1600° C. However, with further rise in temperature to 1700° C, the solid solution desinters to 85%th and creep cavities show transition from grain boundary to lattice creep. In Mo-Al2O3 composite the defects are locked by molybdenum solute, and as a result there is an insignificant increase in densification (30%th at 1600°C).
Journal Article•
TL;DR: Aluminium content, aluminium phosphate activity remained greater than that of aluminium hydroxide although the difference decreased with decreasing pH values, and the buffering capacity was supported by the change of aluminium cation in hydrolysis intermediary compounds.
Abstract: Antacid capacity of two aluminium containing-antacid drugs was evaluated in vitro; the first drug contained aluminium hydroxide (Alternagel), the second, aluminium phosphate (Phosphalugel). The antacid evaluation was performed 1) in a closed system by measuring antacid activity by down titration, 2) by a dynamic evaluation simulating acid secretion and gastric emptying. The results were reported both to the recommended therapeutical dose and to 100 mg aluminium. In static conditions, without gastric emptying, it was shown that aluminium hydroxide and phosphate acted by their buffer capacity in pH range less than or equal to pH 1.5. The therapeutical dose of aluminium phosphate displayed greater antacid activity than aluminium hydroxide, this fact being due to the empiric choice of the doses. With regard to aluminium content, aluminium phosphate activity remained greater than that of aluminium hydroxide although the difference decreased with decreasing pH values. The antacid capacities were related to the emptying outputs. Antacid activity corresponding to 100 mg aluminium was similar in both antacids less than pH 1.5. This effect was dependent on emptying rates. It can be suggested that Al was responsible for antacid activity in both preparations, and that the buffering capacity was supported by the change of aluminium cation in hydrolysis intermediary compounds.
TL;DR: In this article, the Bowden model was used to evaluate the interaction between anion and cation by simultaneously fitting the adsorption data according to the bowden model, and the strongest Zinc-surface interaction was observed in presence of sulfate.
Abstract: Adsorption of Zinc from sulfate or chloride solutions onto aluminium hydroxide was investigated. The interaction between anion and cation was evaluated by simultaneously fitting the adsorption data according to the Bowden model. The strongest Zinc-surface interaction, evidenced by the affinity term (K value), was observed in presence of sulfate. That was interpreted as a result of the enhanced chemical affinity of the surface for the cation due to the adsorption of the anion.
Anionen-Kationen-Wechselwirkungen einer Oberflache mit variabler Ladung
Die Zink-Sorption aus sulfat- bzw. chloridhaltiger Losung durch Al(OH)3 wurde bestimmt. Wechselwirkungen zwischen An- und Kationen wurden durch simultane Anpassung an Adsorptionsdaten mit dem Bowden-Modell berechnet. Die starkste Oberflachen-Wechselwirkung von Zink wurde im Beisein von Sulfat festgestellt, was als Ergebnis chemischer Affinitat des Kations zum sorbierten Anion interpretiert wurde.
Patent•
24 Jan 1987
TL;DR: It is for calcining aluminium hydroxide into alumina with controllable amount of very low to very high content of alpha-alumina The calcination is proceeded with two steps Raw materials are first preheated and then sent into a fluidized bed calcination furnace as mentioned in this paper.
Abstract: It is for calcining aluminium hydroxide into alumina with controllable amount of very low to very high content of alpha-alumina The calcination is proceeded with two steps Raw materials are first preheated and then sent into a fluidized bed calcination furnace The calcined materials that may contain up to 80% alpha-alumina are sent to a cyclone The calcined materials are put for further calcination in a rotary cylindrical kiln attached with an after cooler
Patent•
24 Sep 1987
TL;DR: In this article, an open-cell polyurethane foam is impregnated with a mixture of a carboxyl-containing polychloroprene latex, a zinc salt of a polymetaboric acid and optionally aluminium hydroxide, where zinc oxide has been added to the latex as crosslinking agent before the impregnation.
Abstract: Flame-retardant, non-melting polyurethane foams are obtained by impregnating an open-cell polyurethane foam with a mixture of a carboxyl-containing polychloroprene latex, a zinc salt of a polymetaboric acid and optionally aluminium hydroxide, where zinc oxide has been added to the latex as crosslinking agent before the impregnation.
Patent•
10 Dec 1987
TL;DR: A flooring board can contain from 10 % to 14 % organic binder, from 40 % to 60 % by volume of hollow inorganic microstructures and from 26 % to 50 % of aluminium hydroxide.
Abstract: A flooring board contains from 10 % to 14 % by volume of an organic binder, from 40 % to 60 % by volume of hollow inorganic microstructures and from 26 % to 50 % by volume of aluminium hydroxide. This board can be provided with a coating 1.
31 Dec 1987
TL;DR: In this paper, the aluminium hydroxide formation at 37 °C in aqueous NaCl (0.15 mol dm-3) has been investigated and the following species have been characterized: [Al(OH)]2+, Al(OH)3, [Al[Al[OH]4], Al[Al]5], [Al6]15]3+, and [Al8(OH]22]2+.
Abstract: Aluminium is prone to hydrolyse within a large range of physiological pH. Although this phenomenon has drawn much attention in the recent past, no reliable hydroxide formation constants have been produced so far that can be applied to physiological conditions of ionic strength and temperature. Prior to future aluminium–ligand equilibrium studies, aluminium hydroxide formation at 37 °C in aqueous NaCl (0.15 mol dm–3) has been investigated. The following species have been characterized: [Al(OH)]2+, Al(OH)3, [Al(OH)4]–, [Al3(OH)11]2–, [Al6(OH)15]3+, and [Al8(OH)22]2+.