Abstract：Thermal-releasing mercury is one of important indicating parameters to search for oil and gas deposits. In national standard method (GB/T 29173-2012), the mercury vapor is absorbed using gold-wire mercury trap. Then, the content of thermal-releasing mercury in oil and gas geochemical sample is determined by atomic fluorescence spectrometry (AFS). The absorption efficiency of gold-wire mercury trap will decrease after reuse, leading to system error.The national standard method was modified. The thermal-releasing mercury vapor was absorbed with mixture of potassium permanganate and nitric acid. After reduction using hydroxylamine hydrochloride, the determination of thermal-releasing mercury in oil and gas geochemical exploration sample was realized by cold atomic fluorescence spectrometry. The experimental conditions were optimized, including the concentration of potassium permanganate and nitric acid in absorbent, the sample size, the thermal-releasing time, and the concentration of hydroxylamine hydrochloride solution. The results showed that the linear range of method under optimized conditions was 1.0-1000ng/g. The correlation coefficient was 0.9998 and the detection limit was 0.5ng/g. The proposed method was applied for the determination of thermal-releasing mercury in three certified reference materials of soil and actual oil and gas geochemical exploration samples from five regions. The found results were consistent with the certified values or those obtained by the national standard method. The relative standard deviations (RSD, n=10) were less than 9%.
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