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Method for determining organic phosphorus in water

A determination method and organophosphorus technology, applied in the field of pesticide residue analysis, can solve the problems of low efficiency, poor repeatability, tailing of chromatographic peaks, etc.

Pending Publication Date: 2022-03-01
浙江格临检测股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, some gas chromatography methods have long peak eluting time, and the chromatographic peaks have serious tailing phenomenon, the repeatability is not good, and the measurement error of sample concentration is relatively large, especially for samples with relatively small concentration, which affects More obvious, the measurement speed is slow, the efficiency is low, and the accuracy cannot be guaranteed

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  • Method for determining organic phosphorus in water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Sample nature: industrial wastewater;

[0029] Use a brown ground glass bottle to collect the sample. The sample should be filled with the glass bottle, cover the stopper, and add hydrochloric acid to make the sample weakly acidic. After the sample is collected, it should be analyzed in time. If it cannot be analyzed in time, it can be stored in a refrigerator at 4°C. 3 days.

[0030] Take 100mL sample in a 250mL separatory funnel, adjust the pH of the sample to 6.5 with hydrochloric acid solution, add 5mL chloroform for extraction, shake for 3-5min, after standing to separate layers, collect the organic phase, repeat the extraction three times, and combine the organic phase.

[0031] The combined organic phases were dehydrated with anhydrous sodium sulfate, and concentrated to 1 ml with a parallel concentrator, and anhydrous sodium sulfate was analytically pure.

[0032] Take 1uL of the concentrated liquid gas chromatography and analyze it to obtain the concentration ...

Embodiment 2

[0034] Sample nature: surface water;

[0035] Use a brown ground glass bottle to collect the sample. The sample should be filled with the glass bottle, cover the stopper, and add hydrochloric acid to make the sample weakly acidic. After the sample is collected, it should be analyzed in time. If it cannot be analyzed in time, it can be stored in a refrigerator at 4°C. 3 days.

[0036] Take 100mL sample in a 250mL separatory funnel, adjust the pH of the sample to 6.5 with sodium hydroxide, add 5mL chloroform for extraction, shake for 3-5min, after standing to separate layers, collect the organic phase, repeat the extraction three times, and combine the organic phase .

[0037] The combined organic phases were dehydrated with anhydrous sodium sulfate, and concentrated to 1 ml with a parallel concentrator, and anhydrous sodium sulfate was analytically pure.

[0038] Take 1uL of the concentrated liquid gas chromatography and analyze it to obtain the concentration of each substanc...

Embodiment 3

[0040] Sample nature: groundwater;

[0041] Use a brown ground glass bottle to collect the sample. The sample should be filled with the glass bottle, cover the stopper, and add hydrochloric acid to make the sample weakly acidic. After the sample is collected, it should be analyzed in time. If it cannot be analyzed in time, it can be stored in a refrigerator at 4°C. 3 days.

[0042] Take 100mL sample in a 250mL separatory funnel, adjust the pH of the sample to 6.5 with sodium hydroxide, add 5mL chloroform for extraction, shake for 3-5min, after standing to separate layers, collect the organic phase, repeat the extraction three times, and combine the organic phase .

[0043]The combined organic phases were dehydrated with anhydrous sodium sulfate, and concentrated to 1 ml with a parallel concentrator, and anhydrous sodium sulfate was analytically pure.

[0044] Take 1uL of the concentrated liquid gas chromatography and analyze it to obtain the concentration of each substance, ...

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Abstract

The invention discloses a method for measuring organic phosphorus in water. The method comprises the following steps: (1) drawing a calibration curve; (2) collecting a sample; (3) sample pretreatment; (4) concentrating; (5) analyzing; and (6) obtaining the concentration of each substance. Through the gas chromatograph analysis method of the DB1701 capillary chromatographic column, the peak pattern of each component is better, the accuracy is improved, and the analysis efficiency is also improved.

Description

technical field [0001] The invention relates to the field of analysis methods for pesticide residues, in particular to a method for determining organic phosphorus in water. Background technique [0002] Organophosphorus pesticides have the characteristics of broad spectrum, high efficiency, and many varieties. They are a type of pesticides that are widely used in my country after organochlorine pesticides. They are widely used in agriculture, forestry and fishery. Lakes and near-shore seas have caused serious pollution, which is harmful to people, animals and the environment. [0003] With the intensification of environmental pollution, the detection of environmental pollutants is particularly important. In the prior art, some gas chromatography methods have long peak eluting time, and the chromatographic peaks have serious tailing phenomenon, the repeatability is not good, and the measurement error of sample concentration is relatively large, especially for samples with rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88
CPCG01N30/88G01N2030/884
Inventor 张金玲
Owner 浙江格临检测股份有限公司