排序方式: 共有23条查询结果,搜索用时 15 毫秒
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在以0.1 mol.L-1氯化钾为支持电解质,pH为2.21的B-R缓冲溶液中辛硫磷于-0.72 V(vs.Ag/AgCl)处产生灵敏的还原峰。当辛硫磷的浓度在4×10-5~8×10-4mol.L-1范围内时,浓度与线性扫描还原峰电流呈线性关系。据此对辛硫磷样品作6次平行测定,测得平均值为3.42%,其RSD为1.7%,回收率为98.6%~103.6%。用线性扫描与循环伏安法探讨了该体系的伏安行为,结果表明,辛硫磷在玻碳电极上的电化学还原机理为不可逆过程。 相似文献
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本文采用GDX-102和GDX-501混合树脂富集和气相色谱/质谱联用分离定性的方法。测定了受农药厂排出废水污染的深层地下水中的有机污染物。从样品中检出了三种硫代磷酸酯类化合物.经分析为该农药厂辛硫磷农药生产过程中的降解物和代谢物。 相似文献
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辛硫磷和氯氰菊酯复配制剂的高效液相色谱分析 总被引:1,自引:0,他引:1
提出了同时测定辛硫磷和(高效)氯氰菊酯含量的主同效液相色谱分析方法。采用正相柱、235nm紫外检测,石油醚/乙腈流动相系统实现辛硫磷及其杂质与(高效)氯氰菊酯异构体的良好分离。 相似文献
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The histidine functionalized graphene quantum dots(His-GQDs)react with ruthenium trichloride to form a stable ruthenium complex. This complex is treated in a N2 atmosphere at 600 ℃ for 1 h to obtain a ruthenium-graphene quantum dot composite (Ru-His-GQD). The results of scanning electron microscopy (SEM)and transmission electron microscopy(TEM)analysis demonstrate that Ru-His-GOD has one three-dimensional structure. The diameter of ruthenium nanoparticles is between 40 and 60 nm. Ru-His-GQD is rich in functional groups and has high oxidase-like activity. Based on Ru-His-GQD catalyzed oxidation of 3,3′,5,5′-tetramethylbenzidine(TMB)to produce blue compounds,a photometric method for the determination of phoxim in carrots is established. Phoxim can inhibit the activity of Ru-His-GQD oxidase,resulting in a decrease in the absorbance of the blue compound. When the concentration of phoxim is between 30~240 μg/ L,the absorbance of the oxidation product of TMB at 652 nm decreases linearly with the increase of phoxim concentration. The detection limit of the method reaches 7. 33 μg/L(S/N=3),and the sensitivity is higher than those in literature. It has been successfully applied to the detection of phoxim in carrots. © 2022, Science Press (China). All rights reserved. 相似文献
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In this paper, we use mid-infrared spectroscopy to detect illicit fipronil in phoxim granules by partial least discrimination analysis (PLS-DA). The classification accuracy (CA) of the calibration set and prediction set are both 100.0% with the additive level of fipronil ranges from 0.1% to 5.0%. The results indicate that MIR coupled with chemometric method has the potential in detecting illicit pesticide addition and the proposed method provides a new idea on pesticide quality control. 相似文献
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将多壁碳纳米管(MWCNT′s)置于硝酸-硫酸(1+1)溶液中回流6 h使之净化及功能化。取MWCNT′s 5 mg置于超纯水10 mL中经超声振荡20 min制得其悬浮液,取悬浮液10μL滴加在玻碳电极(GCE)表面,经自然干燥后即得用MWCNT′s修饰的玻碳电极(MWCNT′s/GCE)。基于此修饰电极对辛硫磷的催化还原反应,提出了蔬菜中辛硫磷的循环伏安测定法,在pH 4的乙酸盐支持电解质溶液中,在电位0.78 V(对SCE)处可见明显的还原峰,且其峰电流值与辛硫磷浓度在5.0×10-8~1.0×10-6mol.L-1之间呈线性关系。应用此法分析了两件蔬菜样品,并以此试样为基体加入标准溶液对方法进行回收及精密度试验,测得其回收率的平均值和相对标准偏差(n=5)分别依次为100.3%,96.5%及3.7%,3.2%。 相似文献
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高效液相色谱法测定饲料中辛硫磷残留量 总被引:3,自引:0,他引:3
提出了高效液相色谱法测定饲料中辛硫磷残留量的方法。样品经乙酸乙酯提取,氨基固相萃取小柱净化,所得净化液以反相C18色谱柱为分离柱,以乙腈-水(65+35)混合溶液为流动相,在检测波长280nm处进行测定。辛硫磷的质量浓度与其峰面积在0.10~0.50mg·L-1范围内呈线性关系,方法的检出限(3S/N)为0.10mg·kg-1。加标回收率在80.0%~88.2%之间,测定值的相对标准偏差(n=5)在1.6%~6.5%之间。 相似文献