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Method for determination of arsenic content in wastewater

A determination method and technology for wastewater, which are applied in the preparation of test samples, measurement of color/spectral properties, and material analysis by observing the effect on chemical indicators, which can solve problems such as toxicity, detection error, arsenic loss, etc. The test method is simple, the accuracy is improved, and the process is simplified

Inactive Publication Date: 2017-02-22
DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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Problems solved by technology

The traditional method is to convert pentavalent arsenic into trivalent arsenic first by adding zinc particles to the sample solution, and trivalent arsenic generates gaseous arsine, and then collects the DDTC silver salt method. The gaseous arsine generated is not only toxic but also The cumbersome detection process will cause the loss of arsenic, resulting in detection errors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Take an appropriate amount of industrial wastewater and centrifuge to remove solid sediment in the wastewater, and take the supernatant for detection.

[0021] (2) Take 50 ml of the above sample solution and collect the gaseous arsine produced by the DDTC silver salt method, and then measure the arsenic content.

Embodiment 2

[0023] (1) Take an appropriate amount of industrial wastewater and centrifuge to remove solid sediment in the wastewater, and take the supernatant for detection.

[0024] (2) Take 50ml of the above sample solution and add excess stannous chloride, let it stand for 2 hours, and selectively reduce the high-valence arsenic ions to trivalent arsenic ions, the reaction formula is Sn 2+ +As 5+ =Sn 4+ +As 3+ .

[0025] (3) Add quantitative DTNB to the sample solution reduced by the reducing agent to produce a red complex.

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Abstract

The invention provides a method for determination of arsenic content in wastewater. The method includes: adding excessive stannous chloride weak reducing agent into arsenic-containing solution to completely convert arsenic ions (As<5+> included) in the solution into trivalent arsenic ions; standing for a while, adding sulfo compound DTNB (dinitrobenzoic acid) to generate a red complex, and adopting a spectrophotometer to detect at a position of 327nm. Generation of poisonous gaseous arsenic hydride is avoided due to adoption of the weak reducing agent in detection. By adoption of the method, arsenic loss in arsenic extraction in a traditional way is avoided, the content of arsenic in a sample can be better embodied, and detection sensitivity is substantially improved as compared with previous detection sensitivity.

Description

technical field [0001] The invention relates to a method for determining the content of arsenic, in particular to a method for determining the content of arsenic in waste water. Background technique [0002] Arsenic is a well-known element in our daily life, and ancient arsenic is the oxide of arsenic. The traditional method is to convert pentavalent arsenic into trivalent arsenic first by adding zinc particles to the sample solution, and trivalent arsenic generates gaseous arsine, and then collects the DDTC silver salt method. The gaseous arsine generated is not only toxic but also The cumbersome detection process will cause the loss of arsenic, resulting in detection errors. In the method, trivalent arsenic ions are directly complexed with a thio-based luminescent color developer, and then detected by a spectrophotometer, so as to realize safe, convenient and relatively accurate detection of arsenic ions. Contents of the invention [0003] The present invention aims to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/38G01N21/78
CPCG01N21/31G01N1/38G01N21/78
Inventor 池明刘鑫业李鹏廷
Owner DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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