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Despite the exhaustive extraction procedure, sulfadiazine residues mainly remained non-extractable, indicating the high affinity to the soil matrix.
The USAEME process provided an efficient and exhaustive extraction (enrichment factor ∼100) and, after centrifugation, the extract was ready for GC analysis.
The same sediment was also extracted twice in order to check that an exhaustive extraction of the analytes had occurred.
The acidic solution was basified using saturated Na2CO3 to pH 10, followed by exhaustive extraction with CHCl3 (3 × 4 L) to afford a extract (36 g).
Extraction times and cycles were further optimized, and the results demonstrated that exhaustive extraction could be achieved when 0.2 g of FC powder was extracted with 10 mL of methanol with two sonication cycles of 0.5 h.
Comparative tests of various extraction times and cycles revealed that exhaustive extraction could be achieved when 0.1 g RFH sample powder was extracted with 10 mL 80% methanol by means of sonication for 0.5 h, twice.
Similar(36)
For such exhaustive extractions, it is well established that analyte recovery during extraction and clean-up can be validated by internal standards.
From these results it was possible to assess the importance of lysine-rich non-zeins with accuracy, because of the quantification of non-protein N and the exhaustive extractions of zeins.
Non-exhaustive extraction techniques (NEETs) have been shown to measure the putatively bioavailable fraction of hydrophobic compounds in soil.
In this study, a range of non-exhaustive extraction techniques (NEETs) were assessed for (i) compatibility with a naphthalene responsive biosensor and (ii) correlation with naphthalene biodegradation.
Our results show that higher values were obtained for all of the OPAHs studied in SRM 1649a using the more-exhaustive extraction method E1 (with 10%% methanol) compared to the data generated by extraction method E2 (Table 5).
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