DETERMINATION OF CU, NI, ZN, MN, CO, PB, CD, AND V IN SEAWATER USING FLOW-INJECTION ICP-MS

An automated low pressure flow injection (FI) method is described for the determination of Cu, Ni, Zn, Mn, Co, Pb, Cd, and V in seawater usi ng inductively coupled plasma mass spectrometry (ICP-MS). A column of commercially available iminodiacetate resin was used to sequester the trace elements from a sample of seawater buffered on-line to a pH of 5 .2. Following washing of the column with deionized water, the metals w ere subsequently eluted into the plasma with 1M HNO3. Limits of detect ion were less than 4 min. Calibration ia accomp-lished by means of an aqueous calibration curve. The method was verified by the analysis of two seawater CRMs, NASS-4 and CASS-3.