摘要
研究了用溶液吸收装置对天然气中微量金属元素进行取样,采用电感耦合等离子体（ICP）原子发射光谱法测定其浓度的分析系统。石英材质溶液吸收装置的直径为80 mm、高为130mm,具有较低的干扰和良好的吸收效果。用10%（φ）硝酸溶液浸泡过夜处理后的样品储存瓶对测定结果具有较低的影响。采样流量为0.5L/min时,具有较好的吸收效果和样品代表性。研究优化了ICP发射光谱仪泵速、RF功率、雾化器气体流量、辅助气气体流量、积分时间和冲洗时间等分析条件,以及特征波长。分析系统在此优化条件下显示出高的灵敏度（22种元素检出限从0.1~31.4μg/L）。校准曲线在50.0~1 000.0μg/L范围内显示出良好的线性。该分析系统吸收效率高、结构简单、尺寸小、操作简便、测定范围宽、检出限低,是一种有潜力的天然气中微量金属元素测定系统。
An effective analysis system based on sampling with solution absorption device is studied for the determination of trace metals in natural gas by inductively coupled plasma atomic emission spectrometry（ICP-AES）.The quartz absorption device with diameter of 80 mm and height of 130 mm shows a lower interference and high absorption.The storing sample bottle after soaking overnight with 10% nitric acid solution has a lower impact on the measurement results.The sampling flow of 0.5 L/min displays a better absorption effect and good representative sample.Under the optimized experimental conditions of ICP-AES,such as the pump speed,RF power,nebulizer gas flow,auxiliary gas flow,integration time and rinsing time,as well as characteristic wavelength,the analysis system exhibits high sensitivity（the detection limits of 22 elements from 0.1-31.4μg/L）.The calibration curve is a good linearity in the range of 50.0-1 000.0μg/L.The features of the developed system include high absorption efficiency,simple structure,small size,easy operation,wide measurement range,and low detection limit with a potential for determination of trace metals in natural gas.
出处
《石油与天然气化工》
CAS
北大核心
2016年第4期77-82,共6页
Chemical engineering of oil & gas
基金
国家重大科学仪器设备开发专项课题"激光拉曼光谱气体分析仪的研发与应用-激光拉曼天然气分析仪"(2012YQ16000707)
中国石油科研专项项目"天然气中钙
镁
钠等金属元素测定技术研究"(A201305)
关键词
天然气
微量金属
原子发射光谱
电感耦合
natural gas
trace metal
atomic emission spectrometry
inductive coupling
