Showing papers on "Potassium dichromate published in 1970"

Acute potassium dichromate poisoning. Treated by peritoneal dialysis.

Abstract: Although the industrial hazards of both acute and chronic chromate poisoning are well recognized, 1-2 the ingestion of hexavalent chromium compounds is uncommon and usually fatal. The recording of such oral poisonings in children, particularly potassium dichromate, is extremely rare. 3-7 This brief account records the first ingestion of potassium dichromate by a child treated by peritoneal dialysis. Report of a Case A 14-year-old boy was transferred to UCLA Hospital three days after the ingestion of approximately 1.5 gm of potassium dichromate obtained from his chemistry set and taken in an attempt to "get high." Ingestion was followed immediately by nausea and vomiting. Gastric lavage was performed at a local emergency room, and the presence of chromate in the stomach was confirmed. The patient was admitted to the hospital and given parenteral fluids in an attempt to induce diuresis. Twenty-four hours after admission he became anuric, and his blood urea

Inhibierung der Korrosion von Messing 63/37 in Ammoniumchloridlösungen

Abstract: Kaliumchromat, Kaliumdichromat, Kaliumferrocyanid und Kaliumrhodanid wurden als Inhibitoren der Korrosion von Messing 63/37 in 0,005 m und 0,001 m Ammoniumchloridlosungen untersucht. Bei allen verwendeten Versuchsdauern wird Messing durch Kaliumchromat fast vollstandig geschutzt. Kaliumrhodanid ist wirksamer in 0,01 m Ammoniumchlorid als in 0,005 m Losung. Im Falle von Kaliumrhodanid und Kaliumferrocyanid erreicht die Hemmwirkung ihr Maximum bei einer optimalen Inhibitorkonzentration, wahrend weitere Steigerung der Konzentration zu einer Verringerung der Wirksamkeit fuhrt. Der Wirkungsmechanismus beider Substanzen ist anodisch und kathodisch kontrolliert. Auch Kaliumdichromat ist ein Inhibitor mit gemischter Kontrolle, doch liegt die Wirkung uberwiegend auf den Lokalkathoden. Kaliumchromat verzogert die Korrosion durch Beeinflussung der kathodischen und der anodischen Reaktionen, wobei die kathodische Reaktion starker beeinflusbar wird. Inhibition of the corrosion of 63/37 brass in ammonium chloride solutions Potassium chromate, dichromate, ferrocyanide and thiocynate have been investigated as inhibitors corrosion 63/37 brass in 0.005 M and 0.01 M ammonium chloride solutions. Nearly complete protection is afforded to brass by potassium chromate at all the durations studied. Potassium thiocynate is more effective in 0.01 M ammonium chloride rather than in 0.005 M ammonium chloride. In the case of potassium thiocyanate and potassium ferrocyanide, the efficiency is maximum at the optimum concentration of the inhibitor, further increase in inhibitor concentration induces a decrease in inhibitor efficiency. Both these substances afford protection by mixed control. Potassium dichromate is a mixed type of inhibitor with a predominant action on the local cathodic areas. Potassium chromate retards the corrosion by influencing both cathodic and anodic reactions, cathodic to a greater extent.

Microdetermination of the quinone function: New gasometric and titrimetric methods based on reactions with hydrazine, phenylhydrazine, hydroxylamine, and hydrochloric acid

Abstract: New simple, rapid and accurate microgasometric and titrimetric methods for the determination of quinone function are described. Reduction with hydrazine sulphate and phenylhydrazine chlorohydrate liberate one mole of nitrogen per two moles of quinone in sodium bicarbonate and sulphuric acid media respectively. Hydroxylamine hydrochloride in disodium hydrogen phosphate give off one mole of nitrogen per mole of quinone. Hydrochloric acid adds quantitatively to some quinones to give chlorohydroquinones which are quantitatively determined by titration with potassium dichromate solution. Representative series of quinone samples are analysed, the average recovery is 98.6%.

Primed caseless pellets

Abstract: 1,212,615. Moulding plastic substances. OLIN CORP. 13 Sept., 1968 [6 Nov., 1967], No. 43633/68. Heading B5A. [Also in Divisions C1 and F3] Fibrous grains of nitrocellulose are interlocked under pressure to form a cohesive body 1, by dry compacting the grains under a pressure of 3,500 p.s.i. to 75,000 p.s.i. without the addition of a binder, plasticizer and/or solvent. The body is formed with a cavity 5 in which a priming composition 4 is deposited from an aqueous suspension. The grains of nitrocellulose can be dry blended with ignition and combustion modifiers such as graphite, potassium nitrate, potassium dichromate, potassium sulphate, lead chromate, strontium peroxide, barium peroxide, nitroguanidine, aminotetrazole, PETN, TNT, RDX, red phosphorus, nitroaminoguanidine and nitrostarch.

Research on the Chroming of Diacromo Dyes

Abstract: An attempt has been made to reduce the dyeing time with afterchrome dyes by eliminating the cooling step before afterchroming. This cooling is normally necessary to control the rate of chroming to obtain level dyeings. Other methods of control have been investigated, including the use of chromium fluoride rather than potassium dichromate. Triphenylmethane dyes containing salicylic acid groups can be chromed with chromium(III) at the boil, giving a brighter dyeing and a lower rate of chroming than when dichromate is employed. Salicylic acid azo and some oo′-dihydroxyazo dyes can also be chromed with chromium(III) compounds, but the colours produced differ greatly from those obtained when dichromate is used. With other afterchrome dyes, such as oo′-dihydroxyazo dyes, that have additional substituted or unsubstituted hydroxy] or amino groups capable of interaction with dichromate, the mechanisms of chroming with chromium(III) and chromium(VI) are different.

New Depilation Process

Abstract: 1,186,897 Depilating and tanning UGINE KUHLMANN June 8, 1967 [June 8, 1966], No 26413/67 Heading C6C In depilating a skin, it is treated with an aqueous acidic liquor containing at least 10 g per litre of an alkali metal dichromate, eg sodium or potassium dichromate, and at least one strong mineral acid, e g hydrochloric, nitric, sulphuric or perchloric acid The acidic liquor may contain more than 6 g acid per litre Depilation may be effected by dissolving the dichromate in water, adding the acid or acids and then the skin After acting on the skin, the acidic liquor may be drained off i e recovered, filtered and mixed with suitable known reducing agents and used for chrome-tanning the depilated skin, as mentioned below The treated skin may be subjected to further depilation treatment with an aqueous caustic alkali, eg an aqueous caustic soda solution, to effect complete dissolution of the hairs Before said further depilation treatment, the skin may be rinsed with brine, or treated with an aqueous solution of an organic tanning agent, such as quinone or formaldehyde, to protect the hair side of the skin After the further depilation treatment with aqueous caustic alkali, the skin may be treated with aqueous ammonium sulphate and chrome-tanned with the above-mentioned recovered and reduced liquor The skin, immediately after having been treated with the acidic depilating liquor, may be treated with aqueous sodium hyposulphite to effect tanning Leather produced according to the invention may be conventionally matured, neutralized, dyed and nourished