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Method for determining arsenic content by using turbidimetry method

A turbidimetric and turbidimetric technology, which is used in the measurement of color/spectral properties, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc. It can solve the problem that the accuracy of arsenic content is difficult to obtain. Effective protection, increasing waste liquid treatment time and treatment chemicals, and inability of testers to choose effectively, to reduce the impression of observation results, reduce salt precipitation, and avoid slow response.

Inactive Publication Date: 2019-01-01
HUNAN SHIZHUYUAN NON FERROUS METAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a method for measuring the amount of arsenic by turbidimetry, which can effectively solve the low measurement accuracy of the current turbidimetric method proposed in the background technology for measuring the amount of arsenic. Through a single visual comparison of the color scale, the arsenic content It is difficult to effectively guarantee the accuracy of turbidimetry. At the same time, simple visual turbidimetry can easily cause deviations in the tester's visual senses, resulting in the inability of the tester to effectively select the appropriate standard color scale, resulting in large fluctuations in the error of the arsenic value. At the same time, the existing turbidimetric method needs to use more auxiliary solutions when measuring the amount of arsenic, which increases the time and treatment chemicals required for waste liquid treatment, and increases the cost of the turbidimetric method.

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Embodiment 1

[0040] Embodiment 1: as figure 1 As shown, the present invention provides a kind of technical scheme, the method for measuring arsenic amount by nephelometric method, comprises the steps:

[0041] S1: Weighing of the sample: Weigh the sample through an electronic scale;

[0042] S2: Sample pretreatment: After boiling the sample at high temperature, heat it at low temperature to decompose, add hydrochloric acid, dilute with deionized water, shake well, and place it for clarification;

[0043] S3: Measure the sample solution: filter and clarify the sample solution at a medium speed, take the filtered sample solution and add it to the sample colorimetric tube;

[0044] S4: Add auxiliary solution: Add copper sulfate, calcium hypophosphite and hydrochloric acid to the sample colorimetric tube in sequence;

[0045] S5: Colorimetric tube turbidity treatment: heat the colorimetric tube of the sample, and then remove the flowing water to cool it;

[0046] S6: One-time configuration of...

Embodiment 2

[0072] Embodiment 2: as figure 1 As shown, the present invention provides a kind of technical scheme, the method for measuring arsenic amount by nephelometric method, comprises the steps:

[0073] S1: Weighing of the sample: Weigh the sample through an electronic scale;

[0074] S2: Sample pretreatment: After boiling the sample at high temperature, heat it at low temperature to decompose, add hydrochloric acid, dilute with deionized water, shake well, and place it for clarification;

[0075] S3: Measure the sample solution: filter and clarify the sample solution at a medium speed, take the filtered sample solution and add it to the sample colorimetric tube;

[0076] S4: Add auxiliary solution: add copper sulfate, calcium hypophosphite and hydrochloric acid to the sample colorimetric tube in sequence;

[0077] S5: Colorimetric tube turbidity treatment: heat the sample colorimetric tube, and then remove the flowing water to cool;

[0078] S6: One-time configuration of standar...

Embodiment 3

[0104] Embodiment 3: as figure 1 As shown, the present invention provides a kind of technical scheme, the method for measuring arsenic amount by nephelometric method, comprises the steps:

[0105] S1: Weighing of the sample: Weigh the sample through an electronic scale;

[0106] S2: Sample pretreatment: After boiling the sample at high temperature, heat it at low temperature to decompose, add hydrochloric acid, dilute with deionized water, shake well, and place it for clarification;

[0107] S3: Measure the sample solution: filter and clarify the sample solution at a medium speed, take the filtered sample solution and add it to the sample colorimetric tube;

[0108] S4: Add auxiliary solution: Add copper sulfate, calcium hypophosphite and hydrochloric acid to the sample colorimetric tube in sequence;

[0109] S5: Colorimetric tube turbidity treatment: heat the colorimetric tube of the sample, and then remove the flowing water to cool it;

[0110] S6: One-time configuration ...

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Abstract

The invention discloses a method for determining arsenic content by using a turbidimetry method. The method comprises the following steps: weighing samples; pretreating samples; measuring a sample solution; adding an auxiliary solution; carrying out colorimetric tube turbidity treatment, standard color primary preparation, primary turbidity treatment, standard color secondary preparation and secondary turbidity treatment, and calculating the arsenic content of the samples. The method disclosed by the invention is scientific and reasonable, and is safe and convenient to use; by adopting secondary turbidity and selecting appropriate concentration of hydrochloric acid, the adequacy of reduction reaction is ensured; the precipitation of the salt is reduced so as to further improve the accuracyof the arsenic content and facilitate clearer calculation of the arsenic content in the samples; in addition, a white baffle plate is added in the turbidity process to serve as an observation background, so that the observation is more accurate during visual turbidity and the influence of subjective factors of testers on observation results is reduced. By adopting calcium hypophosphite, the phenomena of reaction failure or even easily cracked accidents due to over-high temperature in the previous sodium phosphate heating process are avoided.

Description

technical field [0001] The invention relates to the technical field of the chemical industry, in particular to a method for determining the amount of arsenic by turbidimetry. Background technique [0002] The chemical symbol of arsenic is As, the atomic number is 33, and there are three allotropes of gray, yellow, and dark brown. It is metallic, with an atomic weight of 74.92 and a specific gravity of 5.73 (14°C). Water, soluble in nitric acid and aqua regia, easily oxidized in humid air, mainly in the form of sulfide minerals (such as realgar As 2 S 2 , orpiment As 2 S 3 etc.) exist in nature, arsenic and its compounds are mainly used in alloy smelting, pesticides, pharmaceuticals, pigments and other industries, and often exist as impurities in raw materials, waste residues, semi-finished products and finished products. In the above-mentioned production or use of arsenic compounds, such as protection Improper inhalation of arsenic-containing air or ingestion of arsenic-...

Claims

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Application Information

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IPC IPC(8): G01N21/82G01N21/25
CPCG01N21/25G01N21/82
Inventor 姚丽娜刘杰温智敏
Owner HUNAN SHIZHUYUAN NON FERROUS METAL
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