Home veterinary drugs and industrial chemicals res

e707004304

Home veterinary drugs and industrial chemicals residue analysis of trace chemical sample preparation technique

9g0) A, a 3,,, Annex 8 Jiao quantitative method is the extraction and determination of naphthalene cable leaves BHC, DBT comparison Niehong Yong Zhiqiang Peng c and f alkaline Import and Export Commodities Inspection Bureau of Hunan, Changsha 'l0007} BHC, DDT residues Di Ye Weisheng volume is an important indicator, has been under the {; national attention. On the naphthalene BHc. Method for determination of DDT or remain many reported a 6 f). Soxhlet method and its extraction method, oscillation and soak method. Among them, the most complete Kui's method, according to switchman 【3】 immersion method and the Soxhlet extraction rate of oscillation is only about 76%. U.S. FDA Linsuo's law limit extraction. Although Soxhlet take complete Kui Ru,[link widoczny dla zalogowanych], but when asked the length of extraction, agents spend a large bin. Feng Xi quantitative technique is adopted to establish a tea BHc. DI) T Rapid determination method of analysis to ask a short, small beech feast, greatly reduced reagent consumption, can hinder and Soxhlet extraction were as accurate as part of § Results of a storm guest experience, equipment and test Jing ShimadzuGC-9AM gas chromatograph ( ECD and the shame of Japan j with C · R3A: Tecat0rHTl043 Soxhlet extractor (Switzerland); LDZ-2 from the self-balancing machine \j; DGF one of 78 high-speed mixed broken http \Test and standard solution Jing Mi literature 『2] II instrument operating Xiao Di pieces 2m × 8m blood filled glass Zhu Qiang O 0.3 a i7 ÷ 3O-2l0 Coated in chrO ∞ 0BO, bHP80 a l00 head on: Zhu Wen 2l0 ℃, aliasing port 250 ℃, detector 300 ℃; plant gas was high purity nitrogen (99.999), flow chu 40ml/minC11rrentln, R & ngel0, tten2'', Soxhlet blow, a 54, a check temperature of 1 {0 ℃,[link widoczny dla zalogowanych], 12 hours three steps to take samples home l00 tea plant in crushing mill, and then quartering reduced from 20g powdered samples placed in high-speed separation of jet milling of the sample uniform system obstruction , accurately weighed 0.600g of sample was added to 10ml centrifuge camp 1ml 1ml of distilled water and acetone mixing 30B, by adding 1ml of petroleum ether {BP60-9O ℃), mixing 1min, centrifuged 3 ∞ iB petroleum ether to another draw 10ml centrifuge tube, and then lml × 2 2 petroleum ether extract residue, petroleum ether extract from each well in jOml centrifuge tube at 60 ℃ bath ventilation drying axis: short-tailed bird really add l, 00ml of petroleum ether, mixed uniform 1Oe. With 026mi × 8 3 sulfuric acid purification, the purification of the sample liquid gas chromatography; glycosides of external standard ref f2 prime】's method, results and discussion and with the Soxhlet method f2】 delineated with the law BHC, like tea and DI) T residues, the results shown in Table 2, Table 1 shows the results of this Law and the Soxhlet method was no significant difference in accuracy and precision meet the requirements of residue analysis,[link widoczny dla zalogowanych], Bong Law Compared with Soxhlet extraction asked only Soxhlet method l/2O. Solvent reduced to 1 / 20 of this Law without the separating funnel, significantly reduced labor intensity, the number of Viagra samples were treated loquat too. Easy to operate. Upon analysis time is short, less reagent and labor intensity, loquat deal with large samples,[link widoczny dla zalogowanych], is simple, and accurate. Available with the same Soxhlet extraction method, there are rather too much value to promote 5 A,[link widoczny dla zalogowanych], one by one, a 6G ∞ a leaf. H. H ... ..., port c system 'lun; +10. H + I. ∞ A ... 0, H. ; - II tI: chu + 1 \I Yong Yinianbeikan Jikougutan ¨