Validation of Flow Injection Analysis Method for Anionic Surfactant Analysis Hanumi Oktiyani Rusdi1,a), M. Bachri Amran2)
1) Departement of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Negeri Malang
Jl. Semarang No. 5, Malang, East Java, Indonesia
2) Departement of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Negeri Malang
Jl. Ganesha No. 10, Bandung, West Java, Indonesia
A method has been developed to analyze anionic surfactants (Sodium Dodecyl Sulfate/SDS) based on the formation of ion pairs of anionic surfactants with cationic dyes (Brilliant Green/BG) preconcentrated using a C18 mini-column. This ion pair was then eluted with an organic solvent such as methanol-chloroform (1:9) as much as 1 mL. Measurements were made using visible light spectrometry at a wavelength of 629 nm. The analytical performance of the developed method provides a precision value of 2.17%, a detection limit of 9.62 ppm, and a sensitivity of 2.2 ppm. Linearity determined through the calibration curve obtained the equation y = 0.002x + 0.009 (R2 = 0.987) with a percent recovery of 82%. The FIA ​-​-performance was determined by the enrichment factor value of 35.08, the efficiency of the concentration of 15 h-1 and the consumptive index value of 9.5 mL. From the analysis performance and FIA performance, it can be concluded that this method can be used for surfactant analysis in water samples. The application of the method on river water samples showed surfactant levels of less than 10 ppm.
