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本文就如何提高CG-1A型冷原子吸收测汞仪的灵敏度提出了一些建议.通过改进气路连接以稳定I_0;对影响吸收池内汞蒸汽瞬时浓度的因素;振摇时间、测定体积、气液比、载气流速等作了条件试验,并确定了最佳测定条件,使灵敏度提高1～2个数量级.最低检出浓度达0.025μg/L(即0.025ppb).为提高该仪器测量精密度和准确度,就仪器的正确使用、峰值的测量、标准的处理及标准曲线的制作、室温的影响、氧化剂的选择等作了条件和对照试验,并提出了应注意的事项.
In this paper, some suggestions are put forward on how to improve the sensitivity of CG-1A cold atomic absorption mercury detector by improving gas connection to stabilize I_0, factors that affect the instantaneous concentration of mercury vapor in the absorption cell, shaking time, measuring volume, Ratio, carrier gas flow rate and other conditions were tested, and to determine the best determination conditions, the sensitivity increased by 1 to 2 orders of magnitude, the minimum detectable concentration of 0.025μg / L (ie 0.025ppb) .In order to improve the measurement accuracy of the instrument And the accuracy of the instrument on the correct use of peak measurement, standard processing and production of standard curve, the impact of room temperature, the choice of oxidants and other conditions and the control test, and made the matters needing attention.