Dma 80 mercury analyzer

The critical feature of the Milestone DMA-80 mercury analyzer is that the samples regardless of solid, gaseous, or liquid can be directly measured without any pretreatment. Therefore, the loss of mercury during the sample preparation, mutual contamination, and environmental pollution are avoided, and reliable analytical data are ensured [34 (link), 66 (link)]. The entire analytical process of each sample takes only 5 minutes, supplemented by a 40 bit autosampler, and the Windows-based operating software greatly improves the efficiency of the analysis. The parameters of the DMA-80 mercury analyzer are listed in Table 3.

Meso-2,3-dimercaptosuccinic acid, ~98%, (DMSA) was obtained from Sigma Aldrich (St. Louis, MO).
Green tea extract (Nestle) was a gift of Mario Ferruzzi, Department of Food Science, Purdue University. The green tea polyphenol concentration in gallic acid equivalents (GAE) was 435 mg GAE/g green tea as analyzed by the Folin assay [16 ]. The catechin content of the green tea was determined by HPLC-ECD as described by Peters et al. [17 (link)]. Each gram of green tea contained 125 mg epigallocatechin, 30 mg epicatechin, 243 mg epigallocatechin gallate, and 35 mg epicatechin gallate.
Green tea and DMSA were analyzed for mercury contamination using the DMA-80 Mercury Analyzer (Milestone, Inc., Monroe, CT). Green tea contained 0.458 ± 0.032 ng/g and DMSA contained 5.361 ± 0.087 ng/g.