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Abstract: A direct immersion solid-phase microextraction coupled with gas chromatography-electron capture detection (SPME-GC-ECD) method was optimized and validated for the quantitative determination of 18 organochlorine pesticides in ground water. Ionic strength, stirring speed, adsorption and desorption time and pH were some of the parameters investigated in order to select the optimum conditions for SPME with a 50/30 DVB/CAR/PDMS fiber coating. The SPME-GC/ECD method showed good linear response below 10ngL−1 with R 2 values in the range of 0.9950–0.9997. The repeatability of the measurements were lower than 10%. Values of relative recoveries located within the acceptable range (80–120%). Limits of quantification (LOQ) from 4.5×10−3 to 1.5ngL−1 were obtained. On average 8 organochlorines were found per sample, even so all the 18 organochlorines were quantified among them. Substances such as endrin ketone, γ-BHC and β-BHC were the pesticides determined in larger concentration (0.06–305ngL−1), while methoxychlor and aldrin in smaller amounts (0.151–1.55ngL−1). Measured levels of organochlorine pesticides were above the limits established by Brazilian regulations. [Copyright &y& Elsevier]

The essential oils obtained of the fruits from Campomanesia xanthocarpa and Campomanesia adamantium (Myrtaceae) were analyzed by GC and GC/MS. Thirty-seven and 38 components were identified in the fruit oil of C. xanthocarpa and C. adamantium, respectively. In the two species, the major constituent was cryptomeridiol (11.9-19.2%). [ABSTRACT FROM AUTHOR]

The essential oil obtained from the leaves of Campomanesia sessiliflora (Myrtaceae) collected in the Mato Grosso do Sul in the vegetative stage was analyzed by GC and GC/MS. Thirty-nine components were identified in the leaf oil. The major constituents in the leaf oil were bicyclogermacrene (22.4%), spathulenol (15.9%) and germacrene D (14.6%). [ABSTRACT FROM AUTHOR]

The essential oils obtained from the fruits of Campomanesia pubescens O. Berg (Myrtaceae) collected in the Mato Grosso do Sul were analyzed by GC and GC/MS. Thirty-eight components were identified in the fruit oil. The major constituent was cryptomeridiol (14.2%). [ABSTRACT FROM AUTHOR]