Since the introduction of ICP-MS, analysts have had to limit total dissolved solids (TDS) levels to 0.1 - 0.2%, to minimize signal drift and matrix suppression. This is achieved by diluting high matrix samples prior to analysis. Dilution has several disadvantages, including increased risk of sample contamination, possibility of dilution error, and additional sample prep time. To avoid the drawbacks of conventional dilution, Agilent has developed a new technique for the handling of high matrix samples - “aerosol dilution” using HMI. The HMI is standard on the 7700x and is configurable for the 7700s (with some parts changes such as nebulizer, lens, etc). HMI is also available as an upgrade for the 7500ce/cx.
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