Metode penentuan nitrit sebagai kompleks 4-(4-Nitrobenzenazo)-1-Aminonaftalen secara ekstraksi spektrofotometri dan membran optik berbasis PVC-DO

2005

en

Thesis

text

A study of extraction-spectrophotometric method for the determination of nitrite as 4-(4-nitrobenze nazo)-1-aminonaphthalene complex using n-amylalcohol and chloroform as organic solvents has been done. The result of this study was further developed for the application of liquid polymeric membrane based on polyvinylchloride-dioctylsebacate (PVC-DOS) as optical membrane for the determination of nitrite by spectrophotometry and visual. Results of the study showed that extraction-spectrophotometric determination of nitrite using n -amylalcohol or chloroform was very sensitive and had low limit of detection. Extraction-spectrophotometric method of nitrite using n -amylalcohol gave range of linear concentration of 0.000-0.054 mg/L NO 2 –N, detection limit of 2.09×10-4 mg/L NO 2–N , and sensitivity of 34.514 ± 0.398 absorbance unit per mg/L of NO 2 –N. Meanwhile, extraction-spectrophotometriy of nitrite using chloroform had range of linear concentration of 0.000-0.100 mg/L NO 2 –N, detection limit of 8.99×10-4 mg/L NO 2 –N, and sensitivity of 18.353 ± 0.456 absorbance unit per mg/L NO2 – – N. Statistically, extraction-spectrophotometric and optical membrane methods of nitrite determination did not show any significant different at significance level of 95%. The liquid polymeric membrane can be used as optical membrane for the determination of nitrite. The optical membrane method by spectrophotometry and visual is good for the determination of nitrite at the concentration range of 0.01-0.11 mg/L NO2–N and 0.02-0.60 mg/L NO2 –N, respectively, while at lower concentration of nitrite, extraction-spectrophotometric method may be used either using namylalcohol or chloroform as organic solvent/extractants