GB/T 5750.9-2023Standard examination methods for drinking water—Part 9: Pesticides indices (English PDF)

4.1 Capillary column gas chromatography

4.1.1 Minimum detection mass concentration

6.2 Solid phase extraction gas chromatography mass spectrometry

Determination by the method described in 15.1 of GB/T 5750.8-2023

7.1.1 Minimum detectable mass concentration

The minimum detectable mass of this method are: dichlorvos, 0.012ng; methomyl, 0.025ng; endosulfan, 0.025ng; leuconazole 0.025ng; methyl parathion, 0.025ng; malathion, 0,025ng; parathion, 0.025ng. If 250mL of water sample is taken after extraction, the minimum detectable mass concentrations are: dichlorvos. 0.05g/L; methomyl, 0.1g/L; endosulfan, 0.1g/L; leuconazole, 0.1g/L; methyl parathion, 0.1ug/L; malathion, 0.1ug/L; parathion, 0.1g/L.

7.1.2 Principle

Trace organic phosphorus in water by dichloromethane extraction, concentration, quantitative injection into the chromatograph, each organic phosphorus in the column one by one separation, in turn in the flame photometric detector hydrogen-rich flame combustion, the emission of 526n wavelength of the characteristic light. The intensity of light is proportional to the amount of phosphorus contained, and this characteristic light is passed through a filter and detected by a photomultiplier tube for quantitative analysis.

8.1 Capillary column gas chromatography

Determination by the method described in 7.1

8.2 solid-phase extraction gas chromatography-mass spectrometry

Determination by GB/T 5750.8-2023 in the method described in 15.1

8.3 Liquid chromatography tandem mass spectrometry

8.3.1 Minimum detection mass concentration

The minimum detectable masses of this method are as follows: nortriptyline, 0.002 ng; mantan, 0.003 ng; methyl parathion, 0.004 ng. When 20 l. water samples are directly injected for determination, the minimum detectable mass concentrations are as follows: nortriptyline, 0.10 g/L; mantan, 0.15 g/L; methyl parathion 0.20ug/L.

The common coexisting ions and compounds in the water do not interfere with the determination of the 3 compounds

This method is only used for the determination of domestic drinking water

8.3.2 Principle

The water sample is filtered through a needle-type microporous membrane and fed directly into the sample, and detected by liquid chromatography tandem mass spectrometry with multiple reaction monitoring (MKM) method for the determination of 3 pesticides in domestic drinking water, namely aldicarb, atrazine and methyl parathion, and quantified by external standard method.

10.1 Capillary column gas chromatography

Determination by the method described in 7.1

10.2 Solid phase extraction gas chromatography mass spectrometry

Determination by the method described in 15.1 of GB/T 5750.8-2023

11.1 Capillary column gas chromatography

Determination according to the method described in 7.1

11.2 solid phase extraction gas chromatography mass spectrometry

Determination by the method described in 15.1 of GB/T 5750.8-2023

12.1 Solid-phase extraction gas chromatography-mass spectrometry

Determination by the method described in GB/T 5750.8-2023 15.1

12.2 Capillary column gas chromatography

12.2.1 Minimum detection mass concentration

The minimum detection mass of this method is 0.006ng, if 500L water samples are taken after treatment, the minimum detection mass concentration is 0.12ug / L.

This method is only used for the determination of domestic drinking water.

13.1 high performance liquid chromatography a - UV detector

13.1.1 Minimum detection mass concentration

The minimum detection mass of this method is 2ng, if the 100mL water sample is taken to determine the minimum detection mass concentration of 0.01mg/L.,,

14.1 Solid phase extraction gas chromatography mass spectrometry

Determination according to the method described in 15.1 of GB/T 5750.8-2023

15.1 Liquid-liquid extraction gas chromatography

15.1.1 Minimum detectable mass concentration

The minimum detectable masses of this method are: methoprene, 0.1ng; 2,4-drops, 0.03ng. If a water sample of 00mL is taken after treatment, the minimum detectable mass concentrations are: methoprene, 0.5ug/L; 2,4-drops, .15ug/L.