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A Possible Indicator of AsH3 Exposure

Arsine (AsH3)-exposed human blood samples were analyzed by high-performance liquid chromatography with inductively coupled plasma mass spectrometry (HPLC-ICP-MS) for arsenic speciation. After exposure of human blood samples to AsH 3 vapor for 90 rain at room temperature, partial hemolysis was observed. Plasma samples from these whole blood samples were prepared by centrifugation at 1600 x g for 10 rain and analyzed by HPLC-ICPMS. In addition to arsenite [As(Ill); degraded from ASH3] , an unidentified arsenic species (As-adduct) was detected at a retention time of 1.1 rain. Following ultrafiltration of the plasma samples using a molecular weight cut-off of 10 kDa, As-adduct was not detected in the filtrate. To clarify the origin of As-adduct, AsH3 was added to blank plasma and As(Ill) was added to both whole blood and hemolyzed blood. Although As(l I I) was detected in all samples, As-adduct was not detected. These results indicate that As-adduct was derived from erythrocytes during the process of hemolysis by AsH 3 and further suggest that As(Ill) and plasma ingredients do not contribute to As-adduct production. Therefore, the presence of As-adduct in blood could represent an indicator of acute arsine poisoning.