提高日立Z-2300火焰偏振塞曼原子吸收灵敏度的探讨

Improvement of the FAAS Sensitivity of HITACHI Z-2300

目的提高日立Z-2300使用的火焰偏振塞曼原子吸收的灵敏度，以满足其对低浓度物质的检测能力。方法使用高效雾化器替代原机火焰雾化器来提高其灵敏度，进而提高其对低浓度元素的检测能力。结果在仪器条件相同的情况下用11个常测元素进行改装前后的比对，发现改装后其灵敏度显著提高，改装后的吸光度（A）值是改装前的2．00～2．85倍（均值为2．34倍），改装后灵敏度（S）是原灵敏度的1．85～2．48倍（均值为2．23倍），检出限（Cu）也由原来的0．0022mg／L降低为0．0009mg／L。结论改装高性能雾化器能显著提高日立原子吸收火焰法的灵敏度，且方法简单有效。

[ Objective] To improve the FAAS sensitivity of HITACHI Z -2300 in order to enhance the detection capacity on the low-concentration substances. [ Methods] In order to enhance the detection capacity on the low-concentration substances, the original flame atomizer was replaced by high performance atomizer to improve the sensitivity. [ Results] Under the same instrument condition, 11 elements were analyzed before and after the replacement; the sensitivity was found to improve significantly; the absorbency （ A ） was 2.00 - 2.85 times of the past （ average 234 times ） ; the sensitivity （S） was 1.85 - 2.48 times of the past （ average 2.23 times） ; the detection limit （Cu） decreased from 0. 0022 mg/L to 0. 0009 mg/L. [ Conclusion] High performance atomizer can significantly improve the FAAS sensitivity of HITACHI Z -2300 and can be operated simply and effectively.