Method for detecting lead tetraethyl in water

A technology for tetraethyl lead and water detection, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of cumbersome operation steps, low precision and sensitivity, etc., and achieve simple operation process, high precision and sensitivity, and detection The effect of accurate data

Inactive Publication Date: 2020-04-24
四川明正检测技术有限公司
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  • Abstract
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Problems solved by technology

[0005] For the problems mentioned in the background technology, the present invention proposes a method for detecting tetraethyl lead in water, which solves the problems of cumbersome detection methods in the prior art, low precision and sensitivity

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Embodiment Construction

[0023] All the features disclosed in this specification, except mutually exclusive features and / or steps, can be combined in any way.

[0024] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with specific examples.

[0025] 1. Selection of purge time

[0026] At room temperature, for the standard solution with the same concentration of 1.00 μg / L, set the purging time to 7, 8, 9, 10, and 11 minutes respectively for the test. Draw a curve with the purge time as the abscissa and the chromatographic peak area of ​​the target as the ordinate. When the purging time is 9min, the chromatographic peak area is the largest, therefore, it is determined that the tetraethyl lead purging time is 9min.

[0027] 2. Selection of purge flow rate

[0028] Under the condition of definite purge time, for the standard solution with the same concentratio...

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Abstract

The invention discloses a method for detecting lead tetraethyl in water, which comprises the following steps: (1) preparing a lead tetraethyl standard solution, and putting the lead tetraethyl standard solution in a sample bottle; (2) firstly adding methanol into the sample bottle, and then adding a water sample to obtain a detection water sample; (3) analyzing the standard solution obtained in the step (1) by using purge and trap-gas chromatography / mass spectrometry, and obtaining a linear regression equation y = b*x + a according to the concentration of the standard solution and the peak area generated by the instrument, where x is the concentration of lead tetraethyl, and y is the peak area; and (4) analyzing the detection water sample in the step (2) by using purge and trap-gas chromatography / mass spectrometry, and calculating the concentration of lead tetraethyl in the sample by using the regression equation in the step (3). The problems of tedious operation steps and low precision and sensitivity of a detection method in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of water quality environment monitoring, in particular to a method for detecting tetraethyl lead in water. Background technique [0002] Tetraethyl lead is an organometallic compound that is 100 times more toxic than metallic lead. It is extremely volatile at room temperature, and can be poisoned by skin contact or inhalation. Tetraethyl lead is a severe neurotoxicant and easily invades the central nervous system. The national standard "Surface Water Environmental Quality Standard" (GB3838-2002) and "Drinking Water Hygienic Standard" (GB5749-2006) both stipulate the limit value of tetraethyl lead, and the limit value requirement is no more than 0.0001mg / L. Tetraethyl lead was once widely used as an additive in gasoline. In order to protect the environment, the State Bureau of Technical Supervision issued the mandatory national standard "Unleaded Gasoline for Vehicles" on December 28, 1999, and on January 1,...

Claims

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Application Information

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IPC IPC(8): G01N30/06G01N30/88
CPCG01N30/06G01N30/88
Inventor 谌香
Owner 四川明正检测技术有限公司
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