BEC(背景等效浓度)=20次空白标准偏差/(20次空白相对标准偏差*标准曲线斜率). Background Equivalent Concentration (BEC)he BEC value is the concentration of an element, which would produce thesame emission intensity as the plasma background measured at the analytewavelength. The BEC serves as an indication of instrument sensitivity which isrelated to torch alignment, plasma viewing height, nebulizer gas flow rate, andincident RF power.背景值是测量一浓度元素在分析波长下产生相应的发射强度。BEC可指示仪器的灵敏度，它与炬管线性、等离子观测的高度，雾化气流量，射频功率有关。