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Deteimination of fipronil and its metabolite MB-46513 in agricultural products
2003
Tsukioka, T. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Sato, M.
An analytical method for an insecticide Fipronil and its metabolite MB 46513 remaining in agricaitunil products has been established which uses GC-ECD and GC/MS for their determination and continuation, respectively. In this method, target compounds are extracted with acetone from agricultural products, concentated, and finally re-extracted with n-hexane. When the sample contains lipid in large quantity, it is first delipidated by partition with acetonitrile, cleaned up with Florisil column, and finally determined by GC-ECD. In the case of vegetables and fruits, which contain lipids in small quantity, the sample is cleaned up with a Florisil column and determined by GOECD. The detection limit of this method is 0.001 micro g/g for both of these kind of samples, the recovery of Fipronil is over 85%, and the C. V. of the recovery is less than 7%. For MB-46513. the recovery is over 63% and its C. V. is less than 9%. This method was applied to 17kinds of agricultural products and no Fipronil and MB46513 were detected.
显示更多 [+] 显示较少 [-]Determination of dimethenamid and cyharofop-butyl in agricultural products by GC/MS
2000
Tsukioka, T. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Yamamoto, A. | Sato, M.
A method by GC/MS has been established for the determination of dimethenamid and cyhalofop-butyl in agricaltural products. Dimethenamid and cyhalofop-butyl were extracted with acetone, concentrated, and re - extracted with n - hexane. The extracts were cleaned up acetonitrile partitioning and florisil column, then determined by GC/MS-SIM. This method was featured of recovery over 75% and it's C.V. below 6%. The detection limits for dimetenamid and cyharofop-butyl were 0.001 micro g/g and 0.002 micro g/g, respectively.
显示更多 [+] 显示较少 [-]Investigation of the cause of sudden death of wild birds by harmful matters such as pesticide
2000
Tsukioka, T. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Terasawa, J. | Yoshida, T. | Yamamoto, A. | Ozawa, H. | Sato, M. | Maruyama, S.
In Nagano Prefecture, the sudden death of many wild birds became appearent in 1997. In order to investigate the cause, the authors developed a simultaneous analytical method using GC/MS. The method was applied to investigate the reason of sudden wild bird death in 3 cases that happened in 1998. Therefore, the every cause was cleared as following. 1) In the case of Komagane City, seeds of buckwheat were found in the residues of their stomachs, and the buckwheat was subjected to analyses. A high concentration of highly toxic insecticide, Methomyl, was detected. The authors presumed that was the cause of birds' death. 2) In the case of Saku City, some flesh, probably from apples was found in the birds' stomachs. The result of flesh analysis was the highly toxic insecticide, EPN, detected in a high concentration. The authors assumed that was the cause of death. 3) In the case of Asashina Village, fish, shrimp, rice, among others were found in the birds' stomachs. The result of their analysis was the highly toxic insecticide, Benfuracarb, detected in a high concentration. The authors assumed that was the cause of death.
显示更多 [+] 显示较少 [-]Survey of pesticide residues in agricultural products in Nagano prefecture [Japan]
2003
Terasawa, J. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Yoshihara, H. | Tsukioka, T. | Miyagawa, A. | Nakazawa, H. | Hanaoka, Y. | Sato, S.
Determination of etoxazole in agricultural products by GC/MS
2002
Tsukioka, T. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Terasawa, J. | Sato, M.
A method by GC/MS has been established for the determination of Etoxazole in agricaltural products. Etoxazole was decomposed by acid contained in citrus fruits, but this decomposition could be prevented by addition of sodium acetate solution and extraction above pH 4. In the present method, the Etoxazole in agricultural products was extracted with acetone above pH 4, concentrated, and reextracted with n-hexane. After partition with acetonitrile followed by chromatographic clean-up with Florisil, the sample was subjected to GC/MS. The present method is excellent in sensitivity and has a detection limit of 0.002 micro g/g, and thus is about 10 times as sensitive as that of GC-NPD. The recovery by the present method is over 85% except for tea, the C.V. of recovery is less than 8%, and the method is applicable to actual samples.
显示更多 [+] 显示较少 [-]Survey of pesticide residues in golf course
1991
Terasawa, J. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Tsukioka, T. | Miyajima, I. | Takeda, Y.
Studies on pesticide residues in foods: Transition of organochlorine pesticide residues in raw milk produced in Nagano (1970-1977)
1979
Yamaura, Y. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Maezawa, H. | Kawamata, S. | Kobayashi, M.
The Transition of organochlorine pesticide residues la raw milk produced in Nagano prefecture during the period of 197O-1977, were investigated. alpha, beta, gamma and delta-BHC, pp'-DDT, pp'-DDE and pp'-DDD, dieldrin were found to be present in raw milk. The following substances were not detected; op'-DDT, aldrin, endrin, heptachlor and heptachlor epoxide. It was observed that the contamination of raw milk by organochlorine pesticides showed a decrease by about 90% in BHC residues for a period of eight years.
显示更多 [+] 显示较少 [-]Determination of anilazine and propazine in agricultural products
2004
Tsukioka, T.(Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Hanaoka, Y. | Sato, S.
An investigation was made to find analytical method for anilazine and propazine remaining in agricultural products. Since anilazine was found to be decomposed enzymatically when applied on cabbage, radish, etc., phosphoric acid was added to the sample to suppress the enzymatic activity before subjecting the sample to an extraction with acetone. The extract was re-extracted into n-hexane, cleaned up with a Florisil column, and finally subjected to a determination with ECD-GC. Propazine was found to be insusceptable to any enzymatic decomposition, but it was subjected to the same acetone extraction and n-hexane re-extraction as with anilazine, separated from anilazine with a Florisil column, and subjected to a determination with NPD-GC. The detection limits of these methods are 0.01 micro g/g for both anilazine and propazine. The addition-recovery experiments conducted resulted in recoveries of over 79 and 82% with coefficient of variation of less than 5.6 and 5.5% for alilazine and propazine, respectively (n=5). The present methods were applied to actual agricultural products, with neither anilazine nor propazine detected (n=22).
显示更多 [+] 显示较少 [-]Determination of pyrimidifen in agricultural products by GC/MS
1999
Tsukioka, T. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Terasawa, J. | Miyagawa, A. | Sato, M.
A method by GC/MS has been established for the determination of Pyrimidifen in agricaltural products. The Pyrimidifen in agricultural products is extracted with acetone, concentrated, and extracted with n-hexane. The solution is cleaned up with a Florisil column and subjected to a determination by GC/MS using p-terphenyl-d14 as the internal standard. This method is featured by the recovery over 80 % with its C .V. below 8 % and the detection limit 1 micro g/kg. This method, excellent in sensitivity and selectivity, is useful as a rutine analytical method for agricultural products.
显示更多 [+] 显示较少 [-]Survey of pesticide residues in vegetables and fruits for the past fifteen years
1989
Yoshida, F. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Yamaura, Y.