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Measurement method for simultaneously detecting arsenic and mercury in soil by dual-channel atomic fluorescence spectrometer

An atomic fluorescence spectrometry and determination method technology is applied in the field of simultaneous detection of arsenic and mercury in soil, which can solve the problems of reducing detection accuracy, costing a lot of work, deviation of detection results, etc., so as to improve measurement efficiency and reduce cumbersome steps. , high precision effect

Pending Publication Date: 2020-01-24
WENZHOU VOCATIONAL COLLEGE OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The detection of atomic fluorescence method is mainly divided into three steps: the preparation of standard solution, the digestion of samples and the measurement of samples. In the prior art, when preparing solutions, different elements have to be prepared separately as standard solutions, and the steps of digestion are also complicated.
Excessive use of liquid and complicated steps will have a certain impact on the test results, resulting in large deviations in the test results and reducing the accuracy of the test
Moreover, when the existing atomic fluorescence method detects different elements, multiple sample injections are required, and different detection parameters must be set for different elements. When the number of samples to be measured is too large, this operation will cost a lot workload, consumes a lot of energy

Method used

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  • Measurement method for simultaneously detecting arsenic and mercury in soil by dual-channel atomic fluorescence spectrometer
  • Measurement method for simultaneously detecting arsenic and mercury in soil by dual-channel atomic fluorescence spectrometer
  • Measurement method for simultaneously detecting arsenic and mercury in soil by dual-channel atomic fluorescence spectrometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Accurately weigh 0.2g air-dried soil sample into a 50ml colorimetric tube, moisten it with distilled water, add 10ml aqua regia, stoppered and shake well, dissolve in a water bath in boiling water at 100℃ for 2h, take it out to cool, and add 3ml hydrochloric acid , 5ml of 5% by mass thiourea solution, 5ml of 5% by mass ascorbic acid solution, dilute to volume with ultrapure water, shake well and place for 2 hours, take the supernatant as the soil sample solution.

[0050] Add 20ml arsenic concentration 60ng / ml, mercury concentration 6ng / ml arsenic and mercury mixed standard solution and 10ml soil sample solution into the autosampler of dual-channel atomic fluorescence spectrometer, set instrument parameters, standard curve concentration and dilution Parameters: After the instrument is warmed up and stabilized, under the drive of reducing agent and carrier liquid, measure in the order of standard blank, standard curve, sample blank, and sample to obtain the calculated parame...

Embodiment 2

[0052] Accurately weigh 0.4g of air-dried soil sample into a 50ml colorimetric tube, moisten it with distilled water, add 10ml of aqua regia, stoppered and shake well, place it in a water bath or low-temperature electric heating plate for 2h in boiling water at 100°C, take it out to cool Add 3ml of hydrochloric acid, 5ml of thiourea solution with a mass volume fraction of 5%, and 5ml of ascorbic acid solution with a mass volume fraction of 5%, make the volume with ultrapure water, shake well and leave for 2 hours, and take the supernatant as the soil sample solution .

[0053] Add 20ml arsenic concentration 60ng / ml, mercury concentration 6ng / ml arsenic and mercury mixed standard solution and 10ml soil sample solution into the autosampler of dual-channel atomic fluorescence spectrometer, set instrument parameters, standard curve concentration and dilution Parameters: After the instrument is warmed up and stabilized, under the drive of reducing agent and carrier liquid, measure in ...

Embodiment 3

[0055] Accurately weigh 0.6g air-dried soil sample into a 50ml colorimetric tube, moisten it with distilled water, add 10ml of aqua regia, stoppered and shake well, put it on a low-temperature electric heating plate and dissolve in 100℃ boiling water for 2h, take it out and cool it, add 3ml Hydrochloric acid, 5ml of thiourea solution with a mass volume fraction of 5%, 5ml of ascorbic acid solution with a mass volume fraction of 5%, make the volume constant with ultrapure water, shake well and place for 2 hours, and take the supernatant as the soil sample solution.

[0056] Add 20ml arsenic concentration 60ng / ml, mercury concentration 6ng / ml arsenic and mercury mixed standard solution and 10ml soil sample solution into the autosampler of dual-channel atomic fluorescence spectrometer, set instrument parameters, standard curve concentration and dilution Parameters: After the instrument is warmed up and stabilized, under the drive of reducing agent and carrier liquid, measure in the o...

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Abstract

The invention discloses a measurement method for simultaneously detecting arsenic and mercury in soil by a dual-channel atomic fluorescence spectrometer. The measurement method comprises the three steps of preparing an arsenic and mercury hybrid standard working solution, decomposing a soil sample and measuring the sample. The measurement method has the following advantages and effects that two elements of arsenic and mercury can be simultaneously detected during sample measurement; meanwhile, arsenic and mercury detection parameters are set, the complicated step of parameter setting during measurement is reduced, the measurement efficiency is improved, and time and labor can be reduced by around 50%; during drawing an arsenic and mercury standard curve, the arsenic and mercury hybrid standard working solution is only needed to be prepared, only the arsenic and mercury hybrid standard working solution is added, the standard curve can be automatically drawn by parameter setting; the decomposition step is simple, and an error in the detection process caused by the complicated step is prevented; and the measurement method is simple to operate and is accurate in measurement result andhigh in accuracy, and the instrument equipment is low in cost, is available and is easy to promote.

Description

Technical field [0001] The invention relates to the technical field of environmental detection, in particular to a method for simultaneously detecting arsenic and mercury in soil by using a dual-channel atomic fluorescence photometer. Background technique [0002] Arsenic is a non-metal element. Arsenic and its compounds are often used in pesticides, herbicides, insecticides, and many kinds of alloys. Mercury is a silvery-white shiny heavy metal that can evaporate at room temperature. Mercury vapor and mercury compounds are mostly highly toxic. Industrial pollution and agricultural pollution are the main sources of arsenic and mercury in the soil, such as waste gas, wastewater and waste residues containing arsenic and mercury, pesticides and pesticides containing arsenic and mercury are all sources of pollution. The detection of arsenic and mercury content in soil is a mandatory item in the national environmental quality standard. In soil analysis, colorimetry, atomic absorptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/38G01N1/44G01N21/64G01N21/01
CPCG01N1/38G01N1/44G01N21/01G01N21/6402
Inventor 张辉徐静王亮谢拾冰张井张维一林定鹏高晴盈陈静静梁秀美徐凤鑫
Owner WENZHOU VOCATIONAL COLLEGE OF SCI & TECH