ISO 2613-1:2023 天然气分析 生物甲烷的硅含量 第1部分：用原子发射光谱法（AES）测定总硅
标准编号：ISO 2613-1:2023
中文名称：天然气分析 生物甲烷的硅含量 第1部分：用原子发射光谱法（AES）测定总硅
英文名称：Analysis of natural gas — Silicon content of biomethane — Part 1: Determination of total silicon by atomic emission spectroscopy (AES)
发布日期：2023-05
标准范围
本文件适用于生物甲烷和沼气等气态基质中总硅含量的测量。硅以气相存在，主要包含在硅氧烷化合物、三甲基硅烷和三甲基硅烷醇中。在进行取样和衍生化程序后，在液相中测量的硅的分析形式是在轻微酸化介质中稳定的可溶性六氟硅酸盐阴离子。总硅表示为所分析气体体积中硅的质量。本文件适用于硅浓度高达5？mg/m3，通常用于Si质量浓度为0.1的生物甲烷基质？mg/m3至0.5？毫克/立方米。通过适应以确保适当的吸收效率，它可以用于更高浓度。方法的检出限估计为0,05？mg/m3按气体样品体积0.020？m3.存在于气相中的所有化合物在吸收和衍生化温度下都是挥发性的，气态有机硅物质被捕获在吸收介质中并衍生成通过该方法测量的分析硅。在微波或电感耦合等离子体中雾化/电离后，使用原子发射光谱法在稀释的衍生化介质中测量硅的浓度。除非另有说明，所有体积和浓度均参考标准参考条件（温度273？K，压力101,325？kPa）。笔记？当使用适当的稀释因子时，该方法也可应用于硅浓度高于5？毫克/立方米。
This document is applicable to the measurement of the total silicon content in gaseous matrices such as biomethane and biogas. Silicon is present in a gas phase contained predominantly in siloxane compounds, trimethylsilane and trimethylsilanol. The analytical form of the silicon measured in liquid phase after conducted sampling and derivatization procedure is soluble hexafluorosilicate anion stable in slightly acidified media. Total silicon is expressed as a mass of silicon in the volume of the analysed gas.
This document is applicable to stated gaseous matrices with silicon concentrations up to 5 mg/m3, and it is prevalently intended for the biomethane matrices with Si mass concentration of 0,1 mg/m3 to 0,5 mg/m3.
With adaptation to ensure appropriate absorption efficiency, it can be used for higher concentrations. The detection limit of the method is estimated as 0,05 mg/m3 based on a gas sample volume of 0,020 m3. All compounds present in the gas phase are volatile at the absorption and derivatization temperature and gaseous organosilicon species are trapped in absorbance media and derivatized into analytical silicon that is measured by this method. The concentration of the silicon is measured in diluted derivatization media using atomic emission spectrometry upon atomisation/ionisation in microwave or inductively coupled plasma.
Unless specified otherwise, all volumes and concentrations refer to standard reference conditions (temperature, 273 K, and pressure, 101,325 kPa).
NOTE When using appropriate dilution factors, the method can also be applied for silicon concentrations above 5 mg/m3.
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