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A related technique, isotope dilution, is an evaluation method that can provide extremely precise measurements of trace element concentrations in geological samples.
Some, particularly the “heavy metals”, are known for their toxicity, and as such are tightly controlled by regulation.Very satisfying isotope ratio precisions, between 0.5 and 0.04% relative, depending on the isotope ratio in question were found during the simultaneous multi-isotope ratio measurements.Together with a brief description of the system and measurement procedures employed for this technical note, the results achieved are assessed in view of other existing ICP-MS-based isotope ratio techniques.Because of the repetitive dosing involved in most treatment regimes, permitted levels have to take into account the cumulative exposure to toxic elements, driving down the Limits of Detection required from analytical procedures.For quality control purposes, the ability to screen for a number of metallic elements at low levels may be required.SPECTRO MS is a double-focusing sector field ICP MS (ICP mass spectrometer) based on a Mattauch-Herzog geometry with a newly developed ion optic and pioneering detector technology.
It is the only ICP MS instrument available on the market today that is capable of simultaneously measuring the complete mass range used for inorganic mass spectrometry from 6Li to 238U with a permanent ion beam going to the detector.
A fully simultaneous ICP-MS, based on a compact Mattauch-Herzog geometry with a permanent magnet and a large, spatially resolving semiconductor ion detector covering the complete inorganic relevant mass range from U isotopic ratio, chosen as example for an isotopic system with a disparate isotope ratio, yielded a precision of 0.05% relative.
To evaluate the expected multi-isotope ratio measurement capabilities of the system used, several isotope ratios spanning a wide range (Pb) were measured simultaneously, using a synthetic multi-element standard as sample.
Mass spectrometry has become a popular and widely used technique in the pharmaceutical industry for the analysis and identification of organic compounds.
The same basic principle can also be applied to elemental analysis, and ICP-MS, in which a mass spectrometer is coupled with inductively coupled plasma as the ion source, is one of the most sensitive techniques available for the detection and quantification of metallic impurities and other inorganic substances in pharmaceutical products.
Fully simultaneous measurement can lead to clearly better precision and to the development of new application areas.