フレームレス原子吸光分析法による岩石・土じょう試料中の微量水銀の定量
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概要
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New device for the determination of trace amount of mercury in rocks and soils as developed for use in our labaratory is a modification of the method reported by Vaughn and McCarthy.<BR>In our system, sample taken in a porcelain boat is heated with electric furnace and the mercury is vaporized and carried up to the gold trap wire by an air stream. Only mercury is selectively trapped on the gold wire making amalgam, and decomposition gases resulted from burning of sulfides and organic materials, and water pass on out the system through the part of gold trap and to the exhaust pipe.<BR>After removal of interfering gases, an air stream is stopped at once, the mercury trapped on the gold wire is vaporized by heating the gold with electric furnace, and the resulting mercury vapor is carried into the absorption cell by starting the flowtation of air stream. A thermocouple equipped on the gold trap control the starting time of air flowtation.<BR>As a result of traverse of the mercury vapor through the absorption cell, atomic absorption signal of mercury at 2537 Å sharply increase to a maximum and quickly return to zero.<BR>The gold trap is allowed to cool to room temperature with an air blow and set up to the another sample.<BR>A number of parameters have been investigated which affect the determination of mercury in this system.<BR>Mercury in rocks and soils is completely vaporized as monoatomic gas by heating with preheated electric furnace at 500°C, within 3minutes. 80μφ pure gold wire used for trapping the mercury was effective. Only 1.5 gram is an adequate amount in the analytical range 1100ng of the mercury. About ten times larger square plates of gold have been used by early investigators.<BR>Adjusting the weight of sample taken, 11000ng of the mercury in rocks and soils has been determined routinely. Coefficient of variation is about 5%. Detection limit using 1 gram sample is 1ng. Time required for the analysis of cne sample is within 6minutes.
- 社団法人 日本分析化学会の論文
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- フレームレス原子吸光分析法による岩石・土じょう試料中の微量水銀の定量