ASTM D6350-14

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 (H_{1.1 This test method covers the determination of total mercury in natural gas streams down to 0.001 μg/m³. It includes procedures to both obtaining a representative sample and the atomic fluorescence detection of the analyte. This procedure can be applied for both organic and inorganic mercury compounds.}

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.