光谱学与光谱分析, 2009, 29 (1): 263, 网络出版: 2009-12-09  

火焰原子吸收光谱法测定油田水中的锂

Determination of Lithium in the Oil Field Water by Flame Atomic Absorption Spectrometry
作者单位
1 中国科学院青海盐湖研究所,青海 西宁 810008
2 中国科学院研究生院,北京 100039
摘要
用空气-乙炔火焰原子吸收光谱法测定了某地区油田水中的微量Li,将标准曲线法与标准加入法进行了比较;对该油田水的稀释倍数及共存离子对测定的影响进行了研究;研究了用NaCl代替Na3PO4作为消电离剂的可能性。研究表明:当油田水样品稀释200倍以及200倍以上时,加标回收率为94.3%-96.9%;用Na3PO4作消电离剂时的加标回收率为94.6%-98.6%,用NaCl代替Na3PO4来消除干扰时,加标回收率为94.2%-96.3%; 标准曲线法用于油田水中微量锂的测定,具有操作简便、准确度高、重现性好等特点。
Abstract
Flame atomic absorption spectrometry was applied to the determination of micro amount of lithium in the oil field water of certain area.In order to determine which method is more appropriate for the determination of lithium content in the oil field water,standard curve method and standard addition method were compared.The effects of dilution,coexistent ions,and deionizers on the determination were studied.For the determination of lithium content in the same diluted oil field water samples,there exist obvious differences between the results obtained from standard addition method and standard curve method.Standard addition method gives results with a larger error,whereas standard curve method gives more accurate results.It is difficult to eliminate the interferences when the standard addition method is used.The standard curve method is found to be more suitable for the determination of micro amount of lithium in the oil field water for its accuracy,simplicity,and feasibility.When the standard curve method is used,both the determined lithium concentration and the recovery change with the dilution extent of the oil field water.In order to get an accurate result,the oil field water sample should be diluted to 1/200 or less.In this case,the recovery by standard addition method ranges from 94.3% to 96.9%.When sodium phosphate or sodium chloride is used as the deionizer,the recovery by standard addition method ranges from 94.6% to 98.6%,or from 94.2% to 96.3%.In the determination of lithium content in oil field water,there are larger experimental errors without the addition of any deionizer.When the concentration of coexistent ions is within an allowed range,the addition of sodium phosphate as a deionizer can eliminate the interferences of the coexistent ions with the determination of the lithium content.If sodium chloride is used as a deionizer,a more accurate result can be obtained when the sodium content in the samples is near the sodium content in the standard solutions.In general,under suitable experimental conditions,sodium chloride can be used as the deionizer for the determination of lithium content in the oil field water.

杨红军, 叶秀深, 李冰, 吴志坚, 李武. 火焰原子吸收光谱法测定油田水中的锂[J]. 光谱学与光谱分析, 2009, 29(1): 263. YANG Hong-jun, YE Xiu-shen, LI Bing, WU Zhi-jian, LI Wu. Determination of Lithium in the Oil Field Water by Flame Atomic Absorption Spectrometry[J]. Spectroscopy and Spectral Analysis, 2009, 29(1): 263.

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