排序方式： 共有9条查询结果，搜索用时 15 毫秒
1
1.
本文采用高效液相色谱法,以甲醇+乙腈+水溶液为流动相,使用Nova-pak C184μm为填料的不锈钢柱和紫外波长检测器,检测波长254nm,对螺螨酯·唑螨酯15%悬浮剂进行的定量分析。结果表明,方法的标准偏差分别为0.043、0.046,变异系数为0.424%、0.895%,平均回收率为99.59%、99.24%,线性相关系数为0.999、0.999。 相似文献
2.
3.
唑螨酯在苹果中残留分析方法研究 总被引：1，自引：0，他引：1
通过对提取、净化方法的优化,建立了唑螨酯在苹果中的残留分析方法.样品以乙酸乙酯匀浆法提取,Florisil柱层析净化,HPLC测定.结果表明,Florisil柱采用梯度淋洗的方法,唑螨酯残留能与苹果共提物有效分离.该方法在苹果中的最低检出浓度为0.025 mg·kg-1,添加回收率(0.1～1.0 mg·kg-1)为82.6%～87.1%,相对标准偏差为3.49%～8.52%.该方法简便快速,灵敏可靠,适用于苹果中唑螨酯残留的测定. 相似文献
4.
采用人工气候箱培养方法,研究了霸螨灵、克螨特及其混剂速霸螨(霸螨灵∶克螨特=1∶3)对土壤过氧化氢酶活性的影响。在培养的第1d到第28d,对于低浓度处理(1mg.kg-1和10mg.kg-1),霸螨灵与克螨特及其混剂速霸螨对土壤过氧化氢酶活性的影响均表现为先抑制后激发,最后恢复到与对照土壤一致;而对于高浓度处理(40mg.kg-1和80mg.kg-1),霸螨灵和混剂速霸螨对土壤过氧化氢酶的影响均表现为先抑制后激发,再抑制,最后趋于恢复。克螨特对土壤过氧化氢酶活性的影响则一直处于被抑制状态。结果表明混剂速霸螨的两种有效成分对土壤过氧化氢酶活性没有产生明显的协同作用。 相似文献
5.
A strain of Tetranychus urticae (Koch; Acari: Tetranychidae), collected from hops (Humulus humuli L; Cannabaceae) in England with a short history of tebufenpyrad use, exhibited resistance to four METI (mitochondrial electron transport inhibitor)-acaricides; tebufenpyrad, pyridaben, fenazaquin and fenpyroximate. Resistance factors for these compounds in a microimmersion assay were 46, 346, 168 and 77 respectively, and corresponded to those exhibited by a Japanese METI-acaricide-resistant reference strain. Levels of resistance remained stable without further selection, and selection with tebufenpyrad did not increase them. The UK strain was also resistant (c 6-fold) to bifenthrin. Crosses of homozygous, diploid females with hemizygous, haploid males showed that, in the UK strain, METI-acaricide resistance was paternally and maternally inherited, and was an incompletely dominant trait. Another tebufenpyrad-resistant strain from the UK, originating from a chrysanthemum nursery (Chrysanthemum foeniculaceum Giseke; Asteraceae) was collected eight months later at a site c 210 km distant from the first. These are the first published incidences of METI-acaricide resistance in Europe and implications for the future use of these compounds are discussed. 相似文献
6.
7.
Fenpyroximate resistance in Tetranychus urticae (Acari: Tetranychidae): cross-resistance and biochemical resistance mechanisms 总被引：1，自引：0，他引：1
A field colony of the Two-spotted spider mite, Tetranychus urticae (Koch), resistant to fenpyroximate was further selected with fenpyroximate 5SC for 20 generations at a selection pressure of 30-50% mortality (designated as FR-20 strain). Resistance and cross-resistance levels of the FR-20 strain to 18 acaricides were determined using a spray method. The FR-20 strain was extremely resistant to fenpyroximate [resistance ratio (RR) 252]. The strain exhibited extremely strong positive cross-resistance to acrinathrin (RR 196), and high levels of resistance to benzoximate (RR 55) and propargite (RR 64). Moderate levels of cross-resistance (RR 11-40) to abamectin, fenbutatin oxide, fenpropathrin, pyridaben, pyridaben + bifenthrin and tebufenpyrad were observed. The FR-20 strain showed low levels of resistance (RR < 10) to azocyclotin, bromopropylate, chlorfenapyr, chlorfenapyr + bifenthrin, chlorfenapyr + pyridaben, dicofol, fenazaquin and milbemectin. Synergist experiments with different metabolic inhibitors revealed that piperonyl butoxide had the greatest effect on the efficacy of fenpyroximate, followed by iprobenfos and triphenyl phosphate. In a comparative assay with detoxifying enzymes, the FR-20 strain showed 2.5-fold higher activity in p-nitroanisole-O-demethylation, and 2.5- and 2.2-fold higher activities in alpha- and beta-naphthyl acetate hydrolysis, respectively. These results suggested that enhanced activities of both mixed-function oxidases and esterases likely contribute to the fenpyroximate resistance of the FR-20 strain of T urticae. 相似文献
8.
QuEChERS-LC-MS/MS测定芹菜中吡虫啉和唑螨酯 总被引：1，自引：0，他引：1
为建立芹菜根、茎、叶中吡虫啉、唑螨酯残留的QuEChERS-LC-MS/MS分析方法,采用QuEChERS方法对样品进行提取和净化,通过液相色谱-串联三重四极杆质谱联用仪(LC-MS/MS)测定样品中吡虫啉、唑螨酯残留。结果表明:添加质量分数为0.05~1.00 mg·kg-1时,吡虫啉在芹菜根、茎、叶中的平均添加回收率为77.15%~103.48%,RSDs为1.40%~9.97%;唑螨酯在芹菜根、茎、叶中的平均添加回收率为77.35%~100.42%,RSDs为2.01%~6.95%。吡虫啉、唑螨酯的检出限(LODs)分别是0.120、0.015 μg·kg-1;吡虫啉在芹菜根、茎、叶的定量限(LOQs)分别为1.65、0.87、1.08 μg·kg-1;唑螨酯在芹菜根、茎、叶的LOQs分别是1.24、0.75、0.78 μg·kg-1。该方法操作简单,回收率、精密度均符合农药残留分析的要求,适合实验室大量样品的检测。 相似文献
9.
采用高效液相色谱法研究热带地区海南田间条件下唑螨酯和炔螨特在柑橘及土壤中的消解动态和最终残留。样品经乙腈提取、NH2固相萃取小柱净化后,采用HPLC-UV检测。结果表明：2009至2010年唑螨酯在柑橘与土壤中的半衰期分别为7.5、7.8 d与14.4、14.7 d,炔螨特在柑橘与土壤中的半衰期分别为7.6、8.4 d与13.1、15.1 d,这2种农药在柑橘与土壤中的消解规律相似。在收获期时,未在柑橘中检出唑螨酯和炔螨特的最终残留,但在土壤中距末次施药14、21 d时,有残留检出,范围为0.08～0.43 mg/kg。 相似文献
1