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Determination method for arsenic of four forms in imported liquefied natural gas

A technology for liquefied natural gas and a determination method, which is applied in the field of determination of four forms of arsenic in liquefied natural gas, and can solve problems such as troublesome determination methods

Inactive Publication Date: 2015-10-28
NANTONG ENTRY EXIT INSPECTION & QUARANTINE BUREAU OF THE PEOPLES REPUBLIC OF CHINA +1
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  • Application Information

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Problems solved by technology

[0002] The determination method of the four forms of arsenic in the imported liquefied natural gas in the prior art is cumbersome and slow, and needs to be further improved

Method used

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  • Determination method for arsenic of four forms in imported liquefied natural gas
  • Determination method for arsenic of four forms in imported liquefied natural gas
  • Determination method for arsenic of four forms in imported liquefied natural gas

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Embodiment Construction

[0043] A method for the determination of four forms of arsenic in imported liquefied natural gas, comprising the following steps:

[0044] (1) Preparation of the solution

[0045] (1) 10mmol / L sodium heptanesulfonate + 10mmol / L citric acid solution: Accurately weigh 2.0225g sodium heptanesulfonate and 1.9212g citric acid in a 100mL beaker, add ultrapure water to dissolve and transfer to a 1000mL beaker , adjust the pH to 4.3 with 10mmol / L sodium hydroxide solution, and filter through a 0.22μm filter membrane after the volumetric flask is constant to volume;

[0046] (2) 100ng / mL mixed standard solution: pipette 571 μL standard substance of arsenate solution, 132 μL standard substance of arsenite solution, 398 μL standard substance of monomethyl arsenic solution and 189 μL standard substance of dimethyl arsenic solution, and place them in a 100ml measuring bottle , add step (1) 10mmol / L sodium heptanesulfonate+10mmol / L citric acid solution to constant volume, and prepare a 100...

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Abstract

The invention discloses a determination method for arsenic of four forms in imported liquefied natural gas. The method comprises the steps of solution preparation, sample pretreatment, HPLC-ICP-MS condition and result determination, result calculation and the like. The determination method is convenient, rapid and accurate to implement.

Description

technical field [0001] The invention relates to a method for determining four forms of arsenic in liquefied natural gas. Background technique [0002] The determination method of the four forms of arsenic in imported liquefied natural gas in the prior art is cumbersome and slow, and needs to be further improved. Contents of the invention [0003] The purpose of the present invention is to provide a convenient and rapid method for the determination of four forms of arsenic in imported liquefied natural gas. [0004] Technical solution of the present invention is: [0005] A method for the determination of four forms of arsenic in imported liquefied natural gas is characterized in that it comprises the following steps: [0006] (1) Preparation of the solution [0007] (1) 10mmol / L sodium heptanesulfonate + 10mmol / L citric acid solution: Accurately weigh 2.0225g sodium heptanesulfonate and 1.9212g citric acid in a 100mL beaker, add ultrapure water to dissolve and transfer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/88
Inventor 张爱平王红卫王超颖李建军封亚辉丁黎李国伟熊伟张晓冬吕翔窦怀智王爱国
Owner NANTONG ENTRY EXIT INSPECTION & QUARANTINE BUREAU OF THE PEOPLES REPUBLIC OF CHINA
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