Experimental design in the analysis of interferential effects for the determination of Sr in high Ca/Sr ratio brine by inductively coupled plasma atomic emission spectroscopy technique

Abstract

The ICP-AES technique and experimental design were employed to precisely determine the content of strontium in high Ca/Sr ratio oil field brine of Qaidam basin (Qinghai province, western China). From the statistical analysis using six factor factorial, it was found that Ca²⁺ is the significant interfering element for the recovery of strontium. Accurate strontium content was derived by eliminating the interference contribution according to the influencing model. The experimental results indicate that, under optimal conditions, the ICP-AES method for strontium determination has low LOD and LOQ, and the precision and accuracy are good with the relatively standard deviation below 1% and recovery between 98.0% ∼ 105.0%.

Keywords:

• experimental design
• strontium
• high Ca/Sr ratio brine
• inductively coupled plasma optical emission spectrometry

Acknowledgement

Financial support came from the Hundreds of Talents Program of the Chinese Academy of Sciences (2005012), the National Natural Science Foundation of China (20872105, 40673022), the National Key Technology R&D Program in the 11th Five Year Plan of China (2006BAB09B07), and the Science Foundation of Qinghai Province, China (2006-G-105). They are gratefully acknowledged.