著者

渡邉 大助 数井 優子 太田 彦人

出版者

日本法科学技術学会

雑誌

日本法科学技術学会誌 (ISSN:18801323)

巻号頁・発行日

pp.762, (Released:2019-08-27)

参考文献数

11

被引用文献数

1

---

The behavior of degradation and diffusion of phosphorus-containing amino acids, glyphosate and glufosinate, in soil was investigated over a long term of up to 6 months. The herbicides were extracted from the soil under strong alkaline condition and quantified by liquid chromatography-tandem mass spectrometry. Diffusion and downward penetration were hardly observed for glyphosate, and was observed for about 90 days in summer and about 185 days in winter. For glufosinate, on the other hand, the observation was relatively short at about 10 days, and diffusion and penetration in soil were slightly observed. In the case when glyphosate or glufosinate is dumped on the ground for criminal purposes, the herbicides could be detected at least for 6 months for glyphosate and 1 month for glufosinate from the surface soil by using the method presented in this paper.

著者

渡邉 大助 数井 優子 太田 彦人

出版者

日本法科学技術学会

雑誌

日本法科学技術学会誌 (ISSN:18801323)

巻号頁・発行日

vol.25, no.1, pp.15-21, 2020 (Released:2020-01-31)

参考文献数

11

被引用文献数

1

---

The behavior of degradation and diffusion of phosphorus-containing amino acids, glyphosate and glufosinate, in soil was investigated over a long term of up to 6 months. The herbicides were extracted from the soil under strong alkaline condition and quantified by liquid chromatography-tandem mass spectrometry. Diffusion and downward penetration were hardly observed for glyphosate, and was observed for about 90 days in summer and about 185 days in winter. For glufosinate, on the other hand, the observation was relatively short at about 10 days, and diffusion and penetration in soil were slightly observed. In the case when glyphosate or glufosinate is dumped on the ground for criminal purposes, the herbicides could be detected at least for 6 months for glyphosate and 1 month for glufosinate from the surface soil by using the method presented in this paper.

著者

大塚 麻衣 山口 晃巨 数井 優子 西田 響 大森 毅 宮口 一

出版者

日本法科学技術学会

雑誌

日本法科学技術学会誌 (ISSN:18801323)

巻号頁・発行日

vol.28, no.2, pp.169-176, 2023 (Released:2023-07-31)

参考文献数

14

---

Cyanide is a gaseous poison which is liberated from cyanide compounds such as potassium cyanide. In spite of high toxicity, cyanide compounds are easily accessible for industrial use, and some contamination cases of cyanide into beverages have occurred. For analysis of cyanide, various analytical methods such as colorimetric methods have been reported. Among those, headspace-gas chromatography-nitrogen phosphorus detection (HS-GC-NPD) is known for its easy pretreatment method and high quantitation ability. The application of HS-GC-NPD analysis to cyanide in blood specimens have been reported by many groups. However, comparison results of some experimental manipulations, such as addition of acid, syringes used for introduction of samples to the GC, and amount of sample introduced into the GC are not clear. In addition, there is no detailed description about application to beverage samples. In this work, we have investigated some experimental manipulation of manual HS-GC-NPD and applied the optimized method to beverage samples. After the optimization, the addition of acid with micropipette in open system and introduction of 100 μL of headspace gas into GC with gastight syringe are recommended. For beverage samples, although variations were larger than standard samples, those variations could be compensated by use of acetonitrile as an internal standard.