Green analysis impact in the determination of iron (Fe) against validation on well water

Abstract

The application of green analysis in the determination of Fe is done by minimizing the amount of material from the standard method (SNI-6989-4-2009) to half, a quarter, and a fifth part. The iron (Fe) test results obtained according to the standard, half, quarter and one-fifth methods respectively were 0.2098; 0.2418; 0.2194; and 0.2080 ppm. These results indicate that well water is safe for consumption because it is below the threshold determined by the Regulation of the Minister of Health of the Republic of Indonesia No. 492 of 2010. Validation of atomic absorption spectrophotometer (SSA) method for determining iron content (Fe) which includes linearity, Limit of Detection (LOD), Limit of Quantification (LOQ), precision, and accuracy shows good results for all variations in composition because following quality control requirements that exist in the standard method. But the one-way ANOVA test results for the four variations showed a significant difference. Composition following standard methods and one-fifth of the parts showed no different results. Whereas the variation in the composition of half and a quarter showed different results from the composition of standard testing. This is due to the composition of half and a quarter parts, the amount of HNO3 used is not integers (in decimal numbers) so that it affects the accuracy of the amount taken.