This standard specifies the determination method for isocarbophos residues in citrus. This standard is applicable to the analysis of isocarbophos pesticide residues in citrus. The detection limit of this method is 1.4×10 GB/T 5009.109-2003 Determination of isocarbophos residues in citrus GB/T5009.109-2003 Standard download decompression password: www.bzxz.net

ICS E7.240
National Standard of the People's Republic of China
GB/T 5009.109—2003
Gn/T149s.a—1991
Determination of carbophos residues in citrus fruits orange2003-08-11 Issued
Ministry of Health of the People's Republic of China
National Chemical Engineering Administration Committee of China
Implementation on 2004-01-01
5009.1892203
This standard replaces G/T14929.3--1994 Method for determination of residual amines, sulfur and other substances in tree materials 3. Compared with GB/T14929.3-1991, the main modifications of this standard are as follows: The Chinese name of the standard is revised, and the Chinese name of the standard is changed to Determination of residual amines, sulfur and other substances in tree materials 3:- According to GB/T20001.4-2000: Rules for standard writing Part 4: Chemical analysis methods have been deleted, and the structure of the original standard has been selected.
This standard is issued and sealed by the Ministry of Health of the People's Republic of China. The drafting units of this standard are Nanjing Agricultural University, Zhaolongting Agricultural Environmental Protection Monitoring Station, and Ministry of Health Product Health Inspection Institute. The main drafters of this standard are Ji Zhuling, Wang Duotian, and Lin Guoqing. The previous standard was first issued in 19, and this is the first time to be updated. D
1 Scope
Determination of residual chlorpyrifos in citrus
This standard specifies the determination method of chlorpyrifos residue in citrus, and is applicable to the analysis of chlorpyrifos pesticide residues in citrus. The detection limit of this method is 1.4×:g+ and the detection rate is .mg/g-2. The sample is heated in 45% acetone and filtered. The filtrate is extracted with dimethicone and concentrated. The sample containing phosphorus is burned on hydrogen gas. The characteristic light of wavelength 25m is emitted in the form of a HIU filter. After the light passes through the filter, it is received by a photoelectric multimeter and converted into an electric signal. After amplification by a micro-amplifier, it is recorded. The peak height of the sample is compared with that of the standard, and the equivalent content of the sample is calculated. 3 Reagents bzxZ.net
3.2 Dimethicone,
3.3 Anhydrous sulfuric acid.
3.4 ​​Celite 45.
3.5 Celite 45.
3,6 Acid activity decay, 30-0 g activated carbon, boil with 1 LFn mF.1 rmal/E. hydrochloric acid for 4 h, then use water to remove the chloride ions in the water, and use it as a desulfurizer.
3.7 Fluorocarbon: 60H--100 months, dry at 550% for 3m, 5% water standard, store in a full container, store at 13073h.
3.8 Water waist micromagnetic standard
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