A cold plasma dielectric barrier discharge atomic emission detector for atmospheric mercury

作者：Puanngam Mahitti; Ohira Shin Ichi; Unob Fuangfa; Wang Jian Hua; Dasgupta Purnendu K^*

来源：Talanta, 2010, 81(3): 1109-1115.

DOI：10.1016/j.talanta.2010.02.005

• Mercury
• Atomic emission
• Dielectric barrier discharge
• Preconcentration on gold
• Airborne mercury

An automated atmospheric elemental mercury analyzer based on the dielectric barrier discharge (DBD) atomic emission technique was developed. The instrument is based on a gold-on tungsten coiled filament preconcentrator fashioned from commercial quartz-halogen lamps, a DBD excitation source and a radiation detector. An in-house program provided system control and data collection. Several types of radiation detectors, e.g., charge coupled device (CCD) array spectrometers, photomultiplier tubes (PMTs) and phototube (PT) are investigated. An argon plasma provided better performance than a nitrogen plasma. With 0.88 standard liters per min sampling rate and preconcentration for 2 min, the estimated (S/N = 3) detection limit was 0.12 ng/L (Hg(0)), the linear range extended at least to 6.6 ng Hg/L. Typical RSD values for determination at the single digit ng/L level ranged from 2.8 to 4.9%. In 19 separate calibrations conducted over 7 clays, the calibration slope had a standard error of 1%. The system was applied to the determination of atmospheric mercury in two different locations.

• 出版日期2010-5-15
• 单位东北大学