主题：【求助】茶叶中除草剂吡氟酰草胺检测方法

Abstract

Decomposition in soil of the herbicide diflufenican, N-(2,4-difluorophenyl)-2-[3-(trifluorome-thyl)phenoxy]-3-pyridinecarboxamide, was studied after application for weed control on Swedish railway embankments. A new sensitive method has been developed for determination of aged residues of diflufenican in soil by gc-ECD. A sample extraction using 100% methanol with “extended shake” was performed. The extract was concentrated and purified on a C₁₈-SPE coiumn. Further clean-up was made by using a Silica SPE column. Minimum level of detection for diflufenican was 0.001 μg g⁻¹ soil. Recovery of diflufenican over the range 0.02 μg g⁻¹ to 0.2 μg g⁻¹soil by this method was generally between 94.3% and 121.2% (15 out of 15 determinations). The amounts of diflufenican found in the soil samples at various times after their application were mainly between 0.2 μg g⁻¹ and level of detection.

看这个介绍，感觉您可以试试日本官方发布的LCMSII法做除草剂，它也用到硅胶柱。

原文由 雾非雾(mcds) 发表:
Gas-Chromatographic Methods for Determination of Diflufenican in Soil

Abstract

Decomposition in soil of the herbicide diflufenican, N-(2,4-difluorophenyl)-2-[3-(trifluorome-thyl)phenoxy]-3-pyridinecarboxamide, was studied after application for weed control on Swedish railway embankments. A new sensitive method has been developed for determination of aged residues of diflufenican in soil by gc-ECD. A sample extraction using 100% methanol with “extended shake” was performed. The extract was concentrated and purified on a C₁₈-SPE coiumn. Further clean-up was made by using a Silica SPE column. Minimum level of detection for diflufenican was 0.001 μg g⁻¹ soil. Recovery of diflufenican over the range 0.02 μg g⁻¹ to 0.2 μg g⁻¹soil by this method was generally between 94.3% and 121.2% (15 out of 15 determinations). The amounts of diflufenican found in the soil samples at various times after their application were mainly between 0.2 μg g⁻¹ and level of detection.

看这个介绍，感觉您可以试试日本官方发布的LCMSII法做除草剂，它也用到硅胶柱。

原文由 雾非雾(mcds) 发表:
Gas-Chromatographic Methods for Determination of Diflufenican in Soil

Abstract

Decomposition in soil of the herbicide diflufenican, N-(2,4-difluorophenyl)-2-[3-(trifluorome-thyl)phenoxy]-3-pyridinecarboxamide, was studied after application for weed control on Swedish railway embankments. A new sensitive method has been developed for determination of aged residues of diflufenican in soil by gc-ECD. A sample extraction using 100% methanol with “extended shake” was performed. The extract was concentrated and purified on a C₁₈-SPE coiumn. Further clean-up was made by using a Silica SPE column. Minimum level of detection for diflufenican was 0.001 μg g⁻¹ soil. Recovery of diflufenican over the range 0.02 μg g⁻¹ to 0.2 μg g⁻¹soil by this method was generally between 94.3% and 121.2% (15 out of 15 determinations). The amounts of diflufenican found in the soil samples at various times after their application were mainly between 0.2 μg g⁻¹ and level of detection.

看这个介绍，感觉您可以试试日本官方发布的LCMSII法做除草剂，它也用到硅胶柱。

原文由 荆棘鸟(zongguitang) 发表:
不是的，硅胶柱是前处理用极性净化小柱，正相吸附剂，GPC柱是凝胶色谱净化柱，净化机理是按照分子和对应孔穴大小来分离的。两者有很大不同。

原文由 荆棘鸟(zongguitang) 发表:
不是的，硅胶柱是前处理用极性净化小柱，正相吸附剂，GPC柱是凝胶色谱净化柱，净化机理是按照分子和对应孔穴大小来分离的。两者有很大不同。