The main objective of this work is to develop an efficient procedure to determine glyphosate in soybean grains. The cleanup of the aqueous extracts was done in two steps, beginning with liquid-liquid partitioning and then solid-phase extraction with anion exchange resin. After derivatization with a mixture of trifluoroacetic anhydride (TFAA) and trifluoroethanol (TFE), quantification was done by gas chromatography coupled to mass spectrometry. The mean recovery and RSD of the spiked samples were, respectively, 80.5% and 3.1% at level 0.200 mg kg-1, 93.3% and 18.7% at level 0.500 mg kg-1 and 92% and 3.5% at level 1.000 mg kg-1. The method was linear in the working range (correlation coefficient = 0.9965).

In the present paper we studied the recoveries of glyphosate, N-(phosphonomethyl)glycine (GLY) and its major metabolite, (aminomethyl)phosphonic acid (AMPA) in soil using national (Brazilian) ion-exchange resins, derivatization by a mixture of trifluoroacetic anhydride and trifluoroethanol and analyses by GC-MS. The quantification limits were 12 ng.g-1 for both compounds and the methodology showed a range of recuperation from 85 to 94% with coefficients of variation (CV) ranging from 4.07 to 6.91% for GLY. For AMPA, the mean recoveries ranged from 87 to 102% with CVs ranging from 5.81 to 6.99%. Additional studies showed that, due to the instability of the derivatized compounds, they must be analysed keeping constant time between derivatization and analysis, preferably less than 24 h.

O uso de DDT em campanhas de saúde pública foi intenso em Mato Grosso, tendo sido suspenso em 1997. Este estudo objetivou determinar os níveis de DDT em amostras de sangue de funcionários da Fundação Nacional de Saúde de Mato Grosso. Foram analisadas 41 amostras de soro sangüíneo de agentes de saúde, 20 de motoristas e 14 de trabalhadores não expostos coletadas em julho de 1999 e outubro de 2000 em duas regiões do Estado (Sinop e Cáceres). Os agentes de saúde e os motoristas estiveram ocupacionalmente expostos, não havendo diferença significativa entre os resultados destes dois grupos nas duas regiões. Não foram encontradas diferenças significativas nos teores de p,p'DDE e DDT total entre os resultados das duas regiões, entretanto, os níveis de p,p´DDT foram significativamente maiores no Distrito de Sinop devido ao fato do DDT ter sido mais intensamente usado neste distrito em anos mais recentes. Os níveis de DDT total variaram de 7,50µg/L a 875,5µg/L (mediana = 135,5µg/L) para os agentes de saúde; de 34,5µg/L a 562,3µg/L (mediana = 147,7µg/L) para os motoristas e de não detectado a 94,8µg/L (mediana = 22,5µg/L) para os trabalhadores não expostos.

DDT was used intensively in vector control programs in Mato Grosso State until 1997. The present study aimed to determine DDT concentrations in blood samples from Brazilian National Health Foundation workers in Mato Grosso. Blood samples were analyzed from 41 sprayers, 20 drivers, and 14 unexposed workers, collected in June 1999 and October 2000 in two regions of the State (Sinop and Cáceres). Sprayers and drivers were occupationally exposed, and no significant differences were found in serum DDT levels between these two groups in either region. Likewise, no significant differences were found in p,p'DDE and total DDT levels between Cáceres and Sinop. However, p,p'DDT levels were higher in Sinop due to the intensive use of this insecticide in the region in recent years. The two regions together showed the following results: total DDT ranging from 7.50µg/L to 875.5µg/L (median = 135.5µg/L) for sprayers; from 34.5µg/L to 562.3µg/L (median = 147.7µg/L) for drivers; and from undetected to 94.8µg/L (median = 22.5µg/L) for unexposed workers.

O uso de DDT em campanhas de saúde pública foi intenso em Mato Grosso, tendo sido suspenso em 1997. Este estudo objetivou determinar os níveis de DDT em amostras de sangue de funcionários da Fundação Nacional de Saúde de Mato Grosso. Foram analisadas 41 amostras de soro sangüíneo de agentes de saúde, 20 de motoristas e 14 de trabalhadores não expostos coletadas em julho de 1999 e outubro de 2000 em duas regiões do Estado (Sinop e Cáceres). Os agentes de saúde e os motoristas estiveram ocupacionalmente expostos, não havendo diferença significativa entre os resultados destes dois grupos nas duas regiões. Não foram encontradas diferenças significativas nos teores de p,p'DDE e DDT total entre os resultados das duas regiões, entretanto, os níveis de p,p´DDT foram significativamente maiores no Distrito de Sinop devido ao fato do DDT ter sido mais intensamente usado neste distrito em anos mais recentes. Os níveis de DDT total variaram de 7,50µg/L a 875,5µg/L (mediana = 135,5µg/L) para os agentes de saúde; de 34,5µg/L a 562,3µg/L (mediana = 147,7µg/L) para os motoristas e de não detectado a 94,8µg/L (mediana = 22,5µg/L) para os trabalhadores não expostos.

DDT was used intensively in vector control programs in Mato Grosso State until 1997. The present study aimed to determine DDT concentrations in blood samples from Brazilian National Health Foundation workers in Mato Grosso. Blood samples were analyzed from 41 sprayers, 20 drivers, and 14 unexposed workers, collected in June 1999 and October 2000 in two regions of the State (Sinop and Cáceres). Sprayers and drivers were occupationally exposed, and no significant differences were found in serum DDT levels between these two groups in either region. Likewise, no significant differences were found in p,p'DDE and total DDT levels between Cáceres and Sinop. However, p,p'DDT levels were higher in Sinop due to the intensive use of this insecticide in the region in recent years. The two regions together showed the following results: total DDT ranging from 7.50µg/L to 875.5µg/L (median = 135.5µg/L) for sprayers; from 34.5µg/L to 562.3µg/L (median = 147.7µg/L) for drivers; and from undetected to 94.8µg/L (median = 22.5µg/L) for unexposed workers.