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Method for detecting trace amounts of copper in soil

A detection method, a technology of trace copper, applied in the field of environmental sample detection, can solve the problems of lengthy sample decomposition steps, sample contamination, loss, etc., and achieve the effect of simple operation, good recovery rate and precision, and low cost

Inactive Publication Date: 2014-12-17
SHAANXI HUALU CHEM ENVIRONMENTAL PROTECTION
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AI Technical Summary

Problems solved by technology

In the process of chemical pretreatment, due to the addition of reagents and lengthy and cumbersome sample decomposition steps, it is easy to cause contamination and loss of samples

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Drawing of standard working curve: Accurately weigh 0.1, 0.2, 0.4, 0.6, 0.8, 1.0g of standard copper content soil, add 50m1 of 1% nitric acid, stir and inject sample to measure absorbance, and make calibration working curve. The standard working curve is:

[0020] Y=0.00214+0.112X, R=0.9989, where X is the concentration (g / 50ml), Y is the absorbance.

[0021] (2) Dry the soil sample properly, grind it in a grinder for 8 minutes, take an appropriate amount of sample through a 360-mesh standard sieve, grind it for 16 minutes, and put it in a desiccator for later use. Weigh 0.5000g of the above-mentioned spare sample and place it in a 100ml beaker. Add 50m1 of 1% nitric acid, under magnetic stirrer stirring, inject the sample at the center of 15mm from the liquid surface, and measure the conditions according to the set atomic absorption spectrometer (wavelength 324.8nm, lamp current 3.0mA, spectral pass band 0.4nm , observation height 6.0mm, acetylene flow rate 1.8L / m...

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Abstract

The invention relates to a method for detecting trace amounts of copper in soil and belongs to the field of environmental sample detection methods. The method includes the steps of properly drying a soil sample, grinding the soil sample in a grinding mill for 8min, sieving appropriate amount of the sample with a sieve of 360 meshes, grinding for 16min, placing in a dryer for being used later, placing 0.5000g of the sample in a beaker of 100ml, adding 50ml of 1% nitric acid, injecting the sample at the center15mm from the liquid surface under the stirring of a magnetic stirrer, measuring the absorbance according to a set measuring condition of an atomic absorption spectrometer, and correspondingly calculating the concentration according to a standard operation curve. According to the method for detecting trace amounts of copper in soil, the trace amounts of copper in soil is detected through the suspended sample injection flame atomic absorption spectrometry, the obtained detection limit is 0.12 mu g / g, the relative standard deviation (RSD) is 4.6%, the recovery is 98-104%, the operation is simple and easy to do, the sensitivity is high, the recovery and accuracy are good, the speed is high and the costs are low.

Description

technical field [0001] The invention relates to a method for detecting trace copper in soil, and belongs to the field of detection methods for environmental samples. Background technique [0002] Copper is one of the main heavy metal pollution elements in soil, and it is a commonly measured element in environmental soil monitoring. The determination of copper in soil samples by atomic absorption spectrometry generally requires dry or wet chemical treatment to prepare the sample into a solution Then measure again. In the process of chemical pretreatment, due to the addition of reagents and lengthy and cumbersome sample decomposition steps, it is easy to cause contamination and loss of samples. Suspension sampling technology can avoid the shortage of chemical pretreatment, and has been paid more and more attention by analysts. [0003] Therefore, it is necessary to develop a detection method for trace copper in soil with high accuracy, high repeatability, simple operation an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 陆强
Owner SHAANXI HUALU CHEM ENVIRONMENTAL PROTECTION
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