Test method verification of chrome heksavalen (Cr-VI) test in waste water using UV-visible spectrophotometer

Verification of the determination of hexavalent chromium (Cr-VI) level refers to SNI-6989-71-2009 using a UV-Visible Spectrophotometer. Verification of determination of hexavalent chromium (Cr-VI) levels in textile wastewater with parameter determination of hexavalent chrome content (Cr VI), linearity value, level of linearity (LOL), method detection level (MDL), precision, accuracy, repeatability, reproducibility, limit of detection (LOD), limit of quantitation (LOQ) using the UV-Visible Spectrophotometry method. Based on the results of the analysis showed that the levels of hexavalent chrome (Cr-VI) in textile wastewater amounted to 0.0224 mg/L so that textile waste samples met the prerequisites for testing SNI-6989-71-2009 because not more than 0.05 mg/L. The linearity value is obtained 0.9999; level of linearity (LOL) of 1 mg/L, detection level (MDL) method of 0.01 mg/L, precision (repeatability) of 4.53% and meeting the requirements of crime which is 10.72%, average accuracy of 93, 43%, reproducibility of 3.59%, limit of detection (LOD) of 0.00856 mg / L, limit of quantitation (LOQ) of 0.02853 mg/L. Based on the results of verification tests it can be concluded that the analysis method is well used for the determination of hexavalent chrome (Cr-VI) levels in textile wastewater samples using a UV-Visible spectrophotometer because all parameters meet the testing requirements so that the method can be used for routine testing.