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Method for determining Se and Te by alkali fusion inductively coupled plasma mass spectrometry

An inductive coupling, plasma technology, applied in the field of Te, ion mass spectrometry determination of Se, can solve the problems of inaccurate determination, high detection limit, inability to eliminate interference, etc., to achieve improved sensitivity, low detection limit, strong anti-interference effect of ability

Active Publication Date: 2020-07-10
广西壮族自治区地质矿产测试研究中心
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Problems solved by technology

Due to the low content of selenium and tellurium in the soil, the current method cannot eliminate the interference of polyatomic ions such as diargon or chlorine argon and zinc oxide on selenium and tellurium, and the detection limit is high, resulting in the inability to accurately determine a small amount of selenium and tellurium in the soil. selenium, tellurium

Method used

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  • Method for determining Se and Te by alkali fusion inductively coupled plasma mass spectrometry
  • Method for determining Se and Te by alkali fusion inductively coupled plasma mass spectrometry
  • Method for determining Se and Te by alkali fusion inductively coupled plasma mass spectrometry

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Embodiment 1

[0027] A method for measuring Se and Te by alkali fusion inductively coupled plasma mass spectrometry, comprising the steps:

[0028] (1) Weigh 0.4000g of the soil sample to be tested in a corundum crucible, add 2.0g Na 2 o 2 After stirring evenly, put the corundum crucible on a refractory plate that has been heated to 500°C, and bake it for about 5 minutes until the sodium peroxide is browned, then transfer it to a muffle furnace that has been heated to 500°C, and heat it to 750°C Insulate and melt for 8 minutes, take out the crucible to cool, put the crucible into a beaker, add 80mL of hot water, then add 0.5μg / mL of 5.00mL Re internal standard solution, stir well with a plastic rod, and then remove the crucible to obtain the sample to be tested;

[0029] (2) While stirring, take 4 mL of the sample to be tested into a 30 mL polytetrafluoroethylene crucible, add 2.5 mL of tartaric acid solution (concentration: 0.8%), shake well, add 3 g of 732 type cation exchange resin, sha...

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Abstract

The invention discloses a method for determining Se and Te by alkali fusion inductively coupled plasma mass spectrometry. The method comprises the following steps: weighing a soil sample to be detected, melting and decomposing the soil sample by using sodium peroxide, separating the solution, adding tartaric acid to enable tungsten, molybdenum, tin and the like to form complex anions, adding 732 type cation exchange resin, and adsorbing most of ions such as sodium, iron, aluminum and zinc in the solution onto the resin to obtain a solution to be detected; measuring mass spectrum counting of selenium and tellurium in a KED mode on an inductively coupled plasma mass spectrometer, measuring a working curve at the same time, substituting the obtained emission intensity counting value into theworking curve, and calculating the content of selenium and tellurium in the to-be-measured liquid. According to the method, through using hydrogen as reaction gas of the collision tank, interference of diargon, argon, chlorine and other polyatoms is eliminated, the signal-to-background ratio is increased by 5-10 times, the selenium detection limit is 0.005 [mu]g / g, the tellurium detection limit is0.002 [mu]g / g, and the problems that at present, diargon or chlorine, argon, zinc oxide and other polyatomic ions interfere with selenium and tellurium, the signal-to-background ratio is low, and thedetection limit cannot meet detection requirements are solved.

Description

technical field [0001] The invention relates to the technical field of measuring soil trace elements, in particular to a method for measuring Se and Te by alkali fusion inductively coupled plasma mass spectrometry. Background technique [0002] Soil is the most basic and important natural resource for human survival and development. Due to the long period of human production activities, especially the rapid development of modern industry, the surface soil has generally been polluted to varying degrees. Therefore, the determination of the content of constant, secondary and trace elements in soil is an important basic work, which is of great significance to ecological environment monitoring, regional resource research, agricultural economic regulation and sustainable development planning of national economy. [0003] At present, the detection of selenium and tellurium in soil and water system sediments is usually dissolved by (acid, hydrofluoric acid, perchloric acid) or (nitr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N27/626
CPCG01N27/626
Inventor 阳国运何雨珊潘倩妮覃盛张文捷刘梓楠黄献珠齐永辉黄庆柒唐裴颖
Owner 广西壮族自治区地质矿产测试研究中心
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