农残项目乙拌磷的稳定性

应助达人

我做过甲拌磷，峰高与峰面积随时间推移越来越小，标液也来自环境保护所，但我问过同行，他们说没这现象，让换其它厂家的标液试试。

应助达人

甲拌磷的响应还是挺高的

应助达人

反正从我们现在检测的项目看，没有发现稳定太差的。不知道您说的稳定性差是不是与您的标准品的保存条件有关？您把乙拌磷标准品保存在什么条件下能说说吗？

应助达人

安瓿瓶装的标准品如果不开封，冷冻保存一年没问题，如果开封就只能配成高标储备液，冷冻保存一年问题也不大。常温保存就不好说了。

应助达人

ANALYTICAL METHODS，列表。

应助达人

二硫松(Disulfoton) 農藥有效成分檢驗方法

一般储存条件下稳定。

应助达人

A liquid chromatography-tandem mass spectrometry method was developed and validated for simultaneous determination of disulfoton and five of its oxidative metabolites (disulfoton-sulfoxide, disulfoton-sulfone, demeton-S, demeton-S-sulfoxide and demeton-S-sulfone) in human whole blood and urine. Extraction was undertaken using a QuEChERS method, which is commonly used in food analysis. D10-Disulfoton was used as the internal standard. Separation was carried out using a CAPCELL-PAK MG II column (35×2.0 mm i.d., 5 μm, Shiseido) with a mobile phase of 10 m mol/L ammonium formate and methanol. This method was applied in an autopsy case, and disulfoton and its oxidative metabolites were successfully detected in both blood and urine. The concentrations of disulfoton in the blood and urine were 360 and 23.8 ng/mL, respectively. There was a relatively low concentration of demeton-S in both the blood (4.0 ng/mL) and urine (45.7 ng/mL). To date, there have been no reported cases of detection of demeton-S in human samples.

应助达人

METHOD 8141B

ORGANOPHOSPHORUS COMPOUNDS BY GAS CHROMATOGRAPHY

应助达人

The Determination of Organophosphorous Pesticides by EPA Method 8141B: Initial Demonstration of Capability for Selected Pesticides Using Automated Solid Phase Extraction (SPE)