Increased sample throughput for ICP-OES applied to U.S. EPA method 200.7
The application of an SC-FAST sample introduction system to the analysis of natural and certified water samples is described. The SC-FAST system consists of an autosampler, sample loop, switching valve, high efficiency nebulizer and a glass cyclonic spray chamber to perform analysis by direct nebulization. The potential benefits of this introduction system are numerous and include: increased throughput, reduced memory effects, increased stability, lower reagent consumption and reduced instrument maintenance. These parameters are evaluated as the system is applied to U.S. EPA Method 200.7 Version 4.4. Results indicate that sample throughput can be nearly tripled while still meeting the requirements outlined in Method 200.7. Sample-to-sample analysis (according to Method 200.7 protocol) is accomplished in 77 s with significantly improved washout compared to ICP-OES analysis by conventional introduction.