Speciation Analysis of Chromium by LC-ICP-MS Besed on ISO 24384

User Benefits

- Enables Cr(III) and Cr(VI) to be measured simultaneously in accordance with ISO 24384. - Suffers less interference from coexisting substances than the conventional method for measuring Cr(VI) and can be analyzed with a simple pretreatment. - Easy to connect instruments simply by attaching the LC column outlet piping to the ICP-MS nebulizer.

Introduction

There are two types of chromium, Cr(III) and Cr(VI), and Cr(VI) is highly toxic. Conventionally, to selectively measure harmful Cr(VI), diphenylcarbazide absorptiometry was used, or Cr(III) was removed beforehand by the iron coprecipitation method and then measured by elemental analysis. However, problems were caused due to interference from coexisting substances and the need for complicated pretreatment operations. In recent years, the speciation analysis method for Cr using LC-ICP-MS has been attracting attention as a solution to such issues. In febrero 2024, ISO 24384 Determination of chromium(VI) and chromium(III) in water was published as a method applicable to the analysis of wastewater, surface water, groundwater and drinking water. In this method, Cr(III) is chelated using 2,6-pyridinedicarboxylic acid (PDCA) or ethylenediaminetetraacetic acid (EDTA) and then separated and quantified by LC-ICP-MS. This method is less prone to interference, is simple to use , and allows simultaneous determination of Cr(III) and Cr(VI). In this application, EDTA was used as a chelating agent, and the results of performing chromium speciation using a Prominence Inert Analysis System connected to an ICPMS-2050 are reported.

3 de diciembre de 2024 GMT