Chromium is rarely found in natural water. However, as hexavalent chromium is highly toxic, the environmental standard for the chromium is specified (NMT 0.05 mg/L). By using the twin injection function, newly installed to ZA3000 series instruments, total chromium in river water was analyzed.
There are two sample injection ports on the twin cuvette (Pyro D HR) and a large volume can be injected while the drying time for the analysis can be set at the same as that for a conventional cuvette (Pyro C HR). The data shown below indicates that chromium in river water at a ng/L level can be detected without concentration.

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分析河水中的鉻（Cr）元素（石墨爐法）.pdf