Method for measuring arsenic by iodine solution absorption method

A technology of iodine solution and absorption method, which is applied to the measurement of color/spectral characteristics, material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, etc. It can solve the problems of toxic waste liquid and achieve Save reagent costs, avoid the use of toxic and harmful reagents, and reduce environmental pollution

Inactive Publication Date: 2010-07-28
BAIYIN NONFERROUS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an accurate and reliable iodine solution absorption method for the determination of arsenic, to solve the problem of the generation of toxic waste liquid in the existing method

Method used

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  • Method for measuring arsenic by iodine solution absorption method

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Embodiment 1

[0027] Take the copper concentrate sample, accurately weigh 0.5000g sample, add 15ml (1+1) sulfuric acid and 5ml nitric acid to a 100ml beaker, cover with a watch glass, dissolve at 100-200°C, and steam until the sulfuric acid is just emerging To smoke, remove to cool. Wash the watch glass and cup wall with water, without covering the watch glass, heat at 100-200°C until sulfuric acid fumes just come out, remove and cool. Transfer to a 100ml volumetric flask. Take an appropriate amount of test solution in a 250ml conical beaker, add 50ml of distilled water, add 15ml (1+1) sulfuric acid, 5ml of potassium iodide solution, mix well, add 0.5ml of tin dichloride solution, shake well, reduce to yellow and disappear, Add 5ml of tartaric acid solution and shake well. Leave it for 10 minutes, add 4 grams of arsenic-free zinc particles, quickly stuff it into a 25ml colorimetric tube with a gas tube and the other end of the tube has been inserted in advance with 10ml of absorption solu...

Embodiment 2- Embodiment 6

[0035] Weigh 5 parts of 0.5000g sample, place them in 100ml beakers respectively, add 15ml (1+1) sulfuric acid, 5ml nitric acid, cover with a watch glass, dissolve at 100-200°C, steam until sulfuric acid fumes are just emerging, remove cool down. Wash the watch glass and cup wall with water, without covering the watch glass, heat at 100-200°C until sulfuric acid fumes just come out, remove and cool. Transfer to a 100ml volumetric flask. Take an appropriate amount of test solution in a 250ml conical beaker, add 50ml of distilled water, add 15ml (1+1) sulfuric acid, add 3ml, 4ml, 5ml, 6ml, 7ml of potassium iodide solution, mix well, add tin dichloride solution 0.5 ml, shake well, restore until the yellow color disappears, add 5ml of tartaric acid, shake well. Leave it for 10 minutes, add 4 grams of arsenic-free zinc particles, quickly stuff it into a 25ml colorimetric tube with a gas tube and the other end of the tube has been inserted in advance with 10ml of absorption soluti...

Embodiment 7- Embodiment 9， comparative example 2

[0040] Embodiment 7-embodiment 9, comparative example 2-comparative example 3

[0041] Weigh 5 parts of 0.5000g sample, place them in 100ml beakers respectively, add 15ml (1+1) sulfuric acid, 5ml nitric acid, cover with a watch glass, dissolve at 100-200°C, steam until sulfuric acid fumes are just emerging, remove cool down. Wash the watch glass and cup wall with water, without covering the watch glass, heat at 100-200°C until sulfuric acid fumes just come out, remove and cool. Transfer to a 100ml volumetric flask. Take an appropriate amount of test solution in a 250ml conical beaker, add 50ml of distilled water, add 15ml (1+1) sulfuric acid, 5ml of potassium iodide solution, mix well, add 0.5ml, 1ml, 2ml, 4ml, 5ml of tin dichloride solution respectively , Shake well, reduce to yellow disappear, add 5ml of tartaric acid solution, shake well. Leave it for 10 minutes, add 4 grams of arsenic-free zinc particles, quickly stuff it into a 25ml colorimetric tube with a gas tube an...

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Abstract

The invention discloses an accurate and reliable method for measuring arsenic by an iodine solution absorption method, which solves the problem that the traditional method produces poisonous waste liquor. In a H2SO4 medium greater than 3.6N, Zn reacts with an acid to produce nascent activated hydrogen; in the presence of KI and acidic SnCl2, As<5+> is reduced into As<3+>, and the trivalent arsenic reacts with the nascent activated hydrogen to produce hydrogen arsenide gas; and the hydrogen arsenide gas is absorbed by an iodine solution and is oxidized into quinquevalent arsenic. In a 0.25 equivalent sulfuric acid medium, the quinquevalent arsenic reacts with ammonium molybdate to produce yellow heteromolybdoarsenic acid. The heteromolybdoarsenic acid is reduced into arsenic molybdenum blue by hydrazine sulfatefor for colorimetric determination. The method for measuring arsenic by iodine solution absorption and the colorimetric determination of the arsenic molybdenum blue is more suitable for the analysis of As in raw materials for copper smelting and semi-finished products of matte anode copper; moreover, the use of poisonous and hazardous reagents is avoided, and environment pollution is reduced.

Description

technical field [0001] The invention relates to an analysis method for arsenic in copper concentrate, anode copper and matte copper. Background technique [0002] In the prior art, the method of toluene extraction has been used to determine the arsenic in raw materials and intermediate materials, and the DDTC-Ag absorptiometry is used to determine the content of arsenic in blister copper and anode copper. However, this method needs to use toxic chemical reagents (toluene, chloroform) all the year round, and the toxic reagents in the analysis process have a great impact on the health of operators, and produce 36000ml of toxic toluene waste liquid, chloroform Waste liquid 12000ml. Although approved by the relevant departments, the waste liquid will be disposed of through landfill, but it will still cause a certain degree of pollution to the environment. [0003] The determination method of trace arsenic in aluminum ingot needs to use atomic fluorescence spectrometer, use arg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79G01N21/31
Inventor 余旦新吴芳曹爱霞
Owner BAIYIN NONFERROUS GROUP
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