采用尖端放电激发源和电荷耦合检测器(CCD)组装了小型化原子发射光谱仪,并将其用于检测微量碘。在酸性条件下以H_2O_2氧化碘离子产生碘蒸气,并由氩气载入尖端放电光源中,激发后产生碘原子发射光谱信号,用CCD光谱仪在206 nm处检测。经优化得到的最佳实验条件为:H_2O_2浓度为2%,尖端放电电压为90 V,载气流速为450 m L·min~(-1);检测信号稳定,相对标准偏差为2.5%,标准曲线的线性范围为0.5~500 mg·L~(-1),线性相关系数大于0.99,碘的检出限低至0.1 mg·L~(-1)。该小型化原子发射光谱仪具有简单、高灵敏度、便携式适用于现场分析等优点。
【英文摘要】
A miniaturized atomic emission spectrometer composed of a point discharge source and a chargecoupled device( CCD) spectrometric detector was constructed and used for the sensitive detection of microamount of iodine.By using hydrogen peroxide,iodide ions were oxidated to iodine vapor,and then the chemical vapor was introduced into the point discharge area with the carrier gas flow of argon. The optical signals were captured and analyzed by the CCD at 206 nm. Under the optimized conditions including 2% hydrog...
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