Determination of ultra-trace level Cr(VI) in seawater using large-volume direct injection by LC-ICP-MS with in-line matrix elimination
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY(2024)
摘要
In this study, we aimed to improve the detection of hexavalent chromium (Cr(VI)) in seawater by using large volume injection and in-line matrix elimination deVIce in conjunction with LC-ICP-MS. Firstly, the sample solution was introduced into the chromatographic separation system through a 1000 mu L quantitative loop. Then, the chromatographically separated solution was precisely introduced into the ICP-MS for analysis at the time of the Cr(VI) peak (2.8-4.2 min) by the valve switch in the in-line matrix elimination. And the separation of Cr(VI) was performed on a Dionex IonPac AG7 analytical column (50 mm x 4 mm, 10 mu m) with 60 mmol L-1 NH4NO3 as the mobile phase at a flow rate of 1.0 mL min(-1) for 5 min. The detection limits (LOD) and limit of quantitation (LOQ) were found to be 0.002 and 0.007 mu g L-1, respectively. Method precision and accuracy were satisfactory at 3.5% relative standard deVIations (RSDs) for 0.1 mu g L-1 of Cr(VI), and 90% similar to 105% recoveries for real samples. The developed method was successfully applied for the analysis of Cr(VI) in enVIronmental seawater samples.
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