Concentration of Hexavalent and Trivalent Chromium in Electroplating Plants

電鍍工廠六價鉻及三價鉻濃度之測定

郭憲文(Hsien-Wen Kuo)

《Mid-Taiwan Journal of Medicine》 8卷4期 (2003/11) Pp. 199-206

https://doi.org/10.6558/MTJM.2003.8(4).3

摘要

Objectives. The objective of this study was to compare the concentrations of hexavalent chromium (Cr(VI)) and trivalent chromium (Cr(III)) in six electroplating factories in central Taiwan.
Methods. The types of electroplating factories included: nickel-Cr (n = 1), mixed (nickel-Cr and hard Cr) Cr (n = 3) and hard Cr (n = 2). In each factory, area samples and personal samples were taken. Cr(VI) was analyzed by visible absorption spectrophotometry (VAS)- graphite furnace and total Cr was analyzed by atomic absorption spectrophotometry (AAS). Concentration of Cr(III) was determined by subtracting Cr(VI) from total Cr.
Results. The results showed that hard Cr factories had higher concentrations of Cr(VI) and Cr(III) than the other Cr factories. In all factories Cr(VI) concentrations were lower than Cr(III) concentrations. Cr(VI) comprised 5% to 10% of total Cr. For Cr(III), there was a significant positive correlation between area and personal sampling (r = 0.62, p ＜ 0.05), but for Cr(VI) there was no statistical significance.
Conclusions. Because Cr(VI) is very unstable during the electroplating process, great care must be taken when conducting air sampling and analysis.

關鍵字

鉻濃度 ； 電鍍工廠 ； 六價鉻 ； 三價鉻

並列摘要

Objectives. The objective of this study was to compare the concentrations of hexavalent chromium (Cr(VI)) and trivalent chromium (Cr(III)) in six electroplating factories in central Taiwan.
Methods. The types of electroplating factories included: nickel-Cr (n = 1), mixed (nickel-Cr and hard Cr) Cr (n = 3) and hard Cr (n = 2). In each factory, area samples and personal samples were taken. Cr(VI) was analyzed by visible absorption spectrophotometry (VAS)- graphite furnace and total Cr was analyzed by atomic absorption spectrophotometry (AAS). Concentration of Cr(III) was determined by subtracting Cr(VI) from total Cr.
Results. The results showed that hard Cr factories had higher concentrations of Cr(VI) and Cr(III) than the other Cr factories. In all factories Cr(VI) concentrations were lower than Cr(III) concentrations. Cr(VI) comprised 5% to 10% of total Cr. For Cr(III), there was a significant positive correlation between area and personal sampling (r = 0.62, p ＜ 0.05), but for Cr(VI) there was no statistical significance.
Conclusions. Because Cr(VI) is very unstable during the electroplating process, great care must be taken when conducting air sampling and analysis.

並列關鍵字

Cr concentration ； electroplating plants ； hexavalent chromium ； trivalent chromium