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Measuring method of content of arsenic in water body

A determination method and content technology, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of residual ozone, gaseous arsine poisonous, and carcinogenic substances, etc., and achieve the effect of streamlining the process, avoiding arsine, and simple test methods

Inactive Publication Date: 2018-04-20
DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The toxicity of trivalent arsenic is more than 50 times that of pentavalent arsenic. Traditional DDTC silver is collected by adding zinc particles to the sample solution to make pentavalent arsenic (first converted to trivalent arsenic) and trivalent arsenic to generate gaseous arsine. The salt method will generate gaseous hydrogen arsine, which is not only poisonous, but also causes the loss of arsenic during the cumbersome detection process, resulting in detection errors
Ozone is usually used as an oxidant in the method of oxidizing trivalent arsenic to pentavalent arsenic, but it is easy to leave ozone in the water body and produce carcinogens

Method used

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  • Measuring method of content of arsenic in water body

Examples

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Embodiment 1

[0015] A method for measuring arsenic content in water, specifically comprising the following steps:

[0016] 1. Prepare arsenic ion standard solution. Take 0.132g of arsenic trioxide, add water and 10mL of 0.01M sodium hydroxide solution, heat to dissolve, and finally dilute to volume in a 1000mL volumetric flask. At this time, the arsenic content in the standard solution was 0.01 mg / mL.

[0017] 2. Draw a standard curve. Take six 50mL volumetric flasks and add arsenic standard solution 0.00 / 2.00 / 4.00 / 6.00 / 8.00 / 10.00mL in turn, make 50mL to a constant volume, add 2mL of 0.01M ammonium molybdate and shake well, add 1mL of ascorbic acid and shake well, take 2mL, the wavelength is Absorbance was measured at 620 nm.

[0018] 3. Take 4 parts of 50mL hot spring water samples, centrifuge to get the supernatant for detection.

[0019] 4. Take two samples above and add 0.5g manganese dioxide to heat to completely convert trivalent arsenic into pentavalent arsenic for detection by ...

Embodiment 2

[0024] The steps of the assay method for arsenic content in a water body described in this example are the same as in Example 1, and the different technical parameters are: add 2.5mL of 0.01M ammonium molybdate in the second step and shake well, add Ascorbic acid 1.5mL shake well.

Embodiment 3

[0026] Each step of the assay method of arsenic content in a water body described in this embodiment is all the same as in Example 1, and the different technical parameters are: add 3mL of ammonium molybdate of 0.01M in the second step and shake well, add ascorbic acid 2mL and shake well.

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Abstract

The invention relates to the technical field of water body detection, in particular to a measuring method of the content of arsenic in a water body. The method comprises the following steps: dispersing manganese dioxide with oxidizability into a water body, heating and stirring the water body, and oxidizing all 3<+> arsenic ions in the water body into 5<+> arsenic ions, so as to reduce the toxicity of arsenic in the water body during detection and improve the detection safety; and ensuring that pentavalent arsenic and molybdenic acid are interacted to produce an arsenic molybdate molybdenic acid mixture, and ensuring that the mixture is reduced into molybdenum blue to perform color development in boiling water to perform the detection of the content of arsenic. The method has the advantages that low-valent arsenic ions are oxidized with an oxidizing agent, the producing of toxic gaseous arsenide hydrogen is avoided, the testing mode is simple, the flow is simplified, and the method issafe and reliable.

Description

technical field [0001] The invention relates to the technical field of water body detection, in particular to a method for measuring arsenic content in water body. Background technique [0002] Arsenic is a well-known element in our daily life, and ancient arsenic is the oxide of arsenic. The abundance of arsenic in nature is the 20th. It has been determined that more than 200 kinds of minerals in the world contain arsenic. The desorption and dissolution of arsenic in these minerals is considered to be the main cause of arsenic pollution in water bodies. However, soaking in hot springs in winter has gradually become a fashion, and the detection of arsenic content in water has become particularly important. [0003] The toxicity of trivalent arsenic is more than 50 times that of pentavalent arsenic. Traditional DDTC silver is collected by adding zinc particles to the sample solution to make pentavalent arsenic (first converted to trivalent arsenic) and trivalent arsenic to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 池明祝玉洪李鹏廷姜大川张润德
Owner DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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