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Each element has a unique isotopic pattern and small differences in the ratios of these isotopes can help in identification of the source, transport and biogeochemical fate of elements in atmospheric bulk deposition, soils, freshwater, and seawater matrices.

Typically, accurate stable metal isotope measurement is achieved by thermal ionization mass spectrometry which can only be found in academic research environments. Applied Speciation and Consulting utilizes its Inductively Coupled Plasma Mass Spectrometer equipped with a Dynamic Reaction Cell to achieve similar results with appropriate QA/QC. This specific instrument not only removes interferences for low level analysis of various matrices, but also allows extremely accurate and precise determination of isotopic ratios limited with counting statistics (<0.1% most ratios). The confidence in isotopic ratio testing is typically limited to sample concentration and matrix interferences. By identification of these interferences and implementation of preconcentration techniques and appropriate sample preparation, the applicability of isotopic ratio testing for most matrices is now a reality. As with every analytical technique, institution of proper sampling plans is a necessity to ensure all localized variables are identified to include all possible sources.

Use of stable isotope ratio testing can often decrease the scope of work for investigative projects ultimately reducing the cost of the investigation and increasing the confidence in results due to the absolute nature of the testing procedure.

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