ASTM D6350 - 14

    Стандартный метод испытания для отбора проб и анализа ртути в природном газе методом атомно-флуоресцентной спектроскопии

    Active Standard ASTM D6350 Developed by Subcommittee: D03.05

    Book of Standards Volume: 05.06


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    Significance and Use

    4.1 This test method can be used to determine the total mercury concentration of a natural gas stream down to 0.001 μg/m3. It can be used to assess compliance with environmental regulations, predict possible damage to gas plant equipment, and monitor the efficiency of mercury removal beds. Where L1 and L2 are the specimen lengths at temperatures T1 and T2, respectively. α is, therefore, obtained by dividing the linear expansion per unit length by the change in temperature.

    4.2 The preferred sampling method for mercury collection is on supported gold sorbent, which allows the element to be trapped and extracted from the interfering matrix of the gas. Thermal desorption of mercury is performed by raising the temperature of the trap by means of a nichrome wire coiled around it.

    4.3 The preferred sampling method for mercury collection is on supported gold sorbent, which allows the element to be trapped and extracted from the interfering matrix of the gas. Thermal desorption of mercury is performed by raising the temperature of the trap by means of a nichrome wire coiled around it.

    4.4 Since AFS demonstrates lower detection limits approaching 0.1 pg, this test method avoids difficulties associated with prolonged sampling time. Saturation of the trap with interferants such as hydrogen sulfide (H2S) is avoided. Average sampling can range between 15 to 30 min, or less.