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目的研究不同基体改进剂对石墨炉原子吸收光谱法测定水中铅的影响,选择最合适的基体改进剂,改进检测方法,并对秦淮河水中的铅进行检测。方法考察4种基体改进剂用石墨炉原子吸收光谱法测定水中铅的效果。优化了基体改进剂的组合方式以及本法的灰化温度、原子化温度。结果硝酸钯-硝酸镁有效地消除了基体组分带来的干扰,把被测元素的损失降至最低。最佳灰化温度为1 000℃,原子化温度为1 900℃。该方法在浓度为1.25μg/L~80.00μg/L时,线性关系良好,线性相关系数(r)为0.999 9,检出限为0.60μg/L,相对标准偏差(RSD)为2.64%~5.55%,样品的加标回收率为90.2%~108.3%。结论以硝酸钯-硝酸镁为基体改进剂能有效降低石墨炉原子吸收光谱法测定地表水中铅的基体干扰,该法具有很好的精密度和准确度,可用于实际水样的测定。
Objective To study the effect of different matrix modifiers on the determination of lead in water by graphite furnace atomic absorption spectrometry, select the most suitable matrix modifier, improve the detection method and detect the lead in Qinhuai River. Methods The effects of four kinds of matrix modifiers on the determination of lead in water by graphite furnace atomic absorption spectrometry were investigated. Optimization of the combination of matrix modifier as well as the law of ashing temperature, atomization temperature. Results The palladium nitrate-magnesium nitrate effectively eliminated the interferences from the matrix components and minimized the loss of the measured elements. The best ashing temperature is 1 000 ℃ and the atomization temperature is 1 900 ℃. The linearity was linear with a linear correlation coefficient (r) of 0.999 9 at a concentration of 1.25μg / L to 80.00μg / L with a detection limit of 0.60μg / L and a relative standard deviation (RSD) of 2.64% -5.55 %, The spiked recoveries of samples ranged from 90.2% to 108.3%. Conclusion The use of palladium nitrate - magnesium nitrate as matrix modifier can effectively reduce the matrix interference of Pb in surface water by graphite furnace atomic absorption spectrometry. The method has good precision and accuracy and can be used for the determination of actual water sample.