Topic
Potassium dichromate
About: Potassium dichromate is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 18967 citations. The topic is also known as: Potassium dichromate(VI) & Chromium potassium oxide.
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TL;DR: In this article, a number of solutions containing different concentrations of silver and dichromate ions and sulphuric acid were investigated for the measurement of doses up to 10 Mrad, using simple empirical equations for the calculation of dose from the absorbance of solutions.
12 citations
TL;DR: In this article, a method for the direct determination of aluminium in human blood and serum by graphite furnace atomic absorption spectrometry using potassium dichromate as a matrix modifier has been developed, which eliminates the need to prepare matrix-matched standards or the use of a standard additions method.
Abstract: A method for the direct determination of aluminium in human blood and serum by graphite furnace atomic absorption spectrometry using potassium dichromate as a matrix modifier has been developed, which eliminates the need to prepare matrix-matched standards or the use of a standard additions method, techniques which are frequently quoted in the literature. The sensitivity for the determination of aluminium was increased by a factor of two in the presence of potassium dichromate over that in the absence of a matrix modifier. The mechanism of this enhancement effect of matrix modification was studied by measuring the molecular absorption of AlO and Al2C2 which are observed in the initial stage of the atomisation process. The recommended method has been applied to the determination of aluminium in human blood and serum.
12 citations
TL;DR: 194 patients were standard photopatch tested with Wastar® as is (coal tar 5%) and 161 patients were photopatched tested with para‐aminobenzoic acid (PABA) 5% in alcohol, potassium dichromate 0.5 in petrolatum, and a mixture of balsams of Peru as is.
Abstract: 194 patients were standard photopatch tested with Wastar® as is (coal tar 5%) and 161 patients were photopatched tested with para-aminobenzoic acid (PABA) 5% in alcohol, potassium dichromate 0.5 in petrolatum, and a mixture of balsams of Peru as is. The photopatches were irradiated with UVA.
40 patients (25%) had phototoxic reactions to Waxtar® and 4 of them showed pigmentation after 7 days. Only a few patients had photocontact urticaria. I patient had a late-reaction to PABA and showed a cross-reaction to glyceryl PABA but a negative reaction to paraphenylenediamine (PPD) and benzociane 5% in the standard test.
No patients had positive photopatch reactions to potassium dichromate when irradiated with UVA.2 patients had phototoxic reactions to balsam of Peru. None had photoallergic reactions.
Standard photopatch testing is a time consuming procedure which creates problems both for the staff and for the patients. The yield of unexpected, relevant positive reactions is insignificant.
From a cost-benefit view, photopatch testing is only warranted in cases giving rise to a clinical suspiction of photodermatitis.
12 citations
TL;DR: In this article, the anodized film of aluminum alloy was composed of an inner thin compact layer (the barrier layer) and an outer thick porous layer, and the sealing process was done by using sodium dichromate (Na2Cr2O7) potassium dichromates (K2Cr 2O7), and boiling water, respectively.
12 citations
Patent•
20 Jan 1993
TL;DR: In this article, a method to dye pure silk with a chromo-liquid extracted from a natural plant known as logwood was described, which showed red or yellow as well as derived secondary or triple colours.
Abstract: This invention discloses a method to dye pure silk with a chromo-liquid extracted from a natural plant known as logwood. It includer pre-mordanting, mixed mordanting and post-mordanting sreps by addition of potassium chromate, sodium chromate, potassium dichromate, sodium dichromate, cobalt sulfate, copper sulfate, ferrous sulfate, iron sulfate, aluminium sulfate, nickle sulfate, calcium chloride, alum and tannic acid. The mordant may be one or more of said material. The dyed pure silk shows red or yellow as well as derived secondary or triple colours. Its advantages are soft lustre, no decolouring, good recurrence nature, and half a class in chromatic aberration, and no poison, harm, and pollution.
12 citations