PENENTUAN BATAS DETEKSI METODE (METHOD DETECTION LEVEL) DAN BATAS KUANTIFIKASI (LIMIT OF QUANTITATION) PENGUJIAN SULFIDA DALAM AIR DAN AIR LIMBAH DENGAN BIRU METILEN SECARA SPEKTROFOTOMETRI

Anwar hadi

Abstract


Batas deteksi metode didefinisikan sebagai konsentrasi analit yang ditentukan sesuai tahapan metode pengujian secara menyeluruh sehingga menghasilkan signal dengan probabilitas 99% bahwa signal tersebut berbeda dengan blanko. Batas deteksi metode dapat diperoleh ketika dilakukan oleh analis yang kompeten dengan menggunakan peralatan terkalibrasi pada keadaan yang dirancang sedemikian rupa sehingga berbeda dengan kegiatan pengujian rutin. Sedangkan batas kuentifikasi adalah konsentrasi analit yang menghasilkan signal lebih besar dari blanko pada kondisi kegiatan rutin laboratorium. Penentuan MDL untuk sulfide secara biru metilen dengan spektrofotometri sesuai APHA edisi 21 tahun 2005, 4500-S2-D adalah 0,01 mg/L dan LoQ 0,02 mg/L. Dengan %RSD = 10,5%, rerata %R = 95% dan MDL < kadar spike < 10 MDL = 0,01 < 0,02 < 0,1 maka MDL dan LoQ dapat diterima sesuai persyaratan US-EPA

Keywords


Sulfida, batas deteksi metode, biru metilen dan spektrofotometri

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References


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DOI: https://doi.org/10.20886/jklh.2010.4.2.70-80

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