D. Beauchemin et Aa. Specht, ANALYSIS OF RIVER WATER BY ICP-MS WITH ONLINE PRECONCENTRATION USING FLOW-INJECTION, Canadian journal of analytical sciences and spectroscopy, 43(2), 1998, pp. 43-48
A flow injection manifold is described for on-line preconcentration of
several elements and their determination by inductively coupled plasm
a mass spectrometry. It incorporates a cleaning column on the buffer l
ine to remove trace contaminants from the buffer prior to its mixing w
ith the sample. A 2 M HNO3 eluent is also used to allow the determinat
ion of elements which suffer from spectroscopic interferences from Cl-
containing compounds. The preconcentration, factor can easily be chang
ed by simply modifying the sample loading time (i.e. the amount of tim
e the sample is pumped through the analytical column). A 30-fold preco
ncentration (using 1.5 ml of sample and 50 mu l of eluent) was used fo
r the analysis of certified river water SLRS-2. Under these conditions
, the sample throughput was about 20 samples/h. Results in good agreem
ent with the certified values were obtained for V, Co, Cd and Pb by th
e method of standard additions, and for V, Co, Cd and Sb by external c
alibration. Both calibration strategies provided results of similar ac
curacy and precision, but the latter is far less time-consuming. On th
e other hand, the trace determination of ubiquitous elements such as Z
n is still precluded by a high blank.