提出了流动注射-微波等离子体炬-原子发射光谱法(FI-MPT-AES)的峰宽定量法。 考察了峰宽定量在不同发射强度下的灵敏度和线性， 测定了在多种基体元素下Zn2+， Cu2+和Ag+的峰宽回收率， 并与峰高定量法的测定结果进行了对比。 结果表明在FI-MPT-AES系统中采用峰宽定量可有效地消除基体干扰， 扩展线性测定范围。 本方法的优化条件是： 进样体积350　μL、 载流流速1.5　mL·min-1、 微波功率110　W、 载气流量1.4　L·min-1、 工作气(氩)流量0.4　L·min-1。 在所选实验条件下， 用FI-MPT-AES峰宽定量法和峰高定量两种方法， 对某水库水样中的K+， Ca2+， Zn2+， Cu2+， Ag+进行测定和回收率计算， 发现FI-MPT-AES峰高定量的标准添加回收率在61.3%～122%， 其峰宽定量的标准添加回收率在92%～107%， 峰宽定量明显优于常规的峰高定量。

A peak-width quantitation method for flow-injection microwave plasma torch atomic emission spectrometry was proposed. Sensitivity and linearity of the peak-width quantitation were investigated under different emission intensities. Recoveries of Zn2+, Cu2+ and Ag+ existing in various matrix were determined by using the peak-width quantitation, and were compared with the results obtained by the peak-height method. The results indicated that the peak-width quantitation can efficiently remove matrix interference in the FI-MPT-AES system, and expand its linear determination range. The peak-width quantitation (recovery: 92%-107%) surpasses conventional peak-height method (recovery: 61.3%-122%). Optimized determination conditions were as follows: the sampling volume was 350 mL, the flow rate of the carrier was 1.5 mL·min-1, the power of microwave was 110 W, the flow rates of the carrier gas and working gas (argon) were 1.4 and 0.4 L·min-1, respectively.