简介:2.1 A measured volume of sample is adjusted to a specified pH (see Table 1) and then
extracted using a Solid-phase Extraction (SPE) device.
2.2 Target analytes are eluted from the solid-phase media using methylene chlo简介:2.1 A measured volume of sample is adjusted to a specified pH (see Table 1) and then
extracted using a Solid-phase Extraction (SPE) device.
2.2 Target analytes are eluted from the solid-phase media using methylene chloride or other
appropriate solvent. The resulting solvent extract is dried using sodium sulfate and concentrated.
2.3 The concentrated extract may be exchanged into a solvent compatible with subsequent
cleanup procedures (Chapter Four, Sec. 4.2) or determinative procedures (Chapter Four, Sec. 4.3)
employed for the measurement of the target analytes.详细>