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Senin, 12 September 2011

Penentuan Kadar Amonium (NH4)

Amonium (NH4)


Prinsip Kerja :
Ion ammonium (NH4) dengan suasana basa akan bereakdi dengan larutan nessler yang akan membentuk senyawa kompleks  yang berwarna kuning sampai coklat , warna tersebut di ukur serapannya secara spektrofotometri pada panjang gelombang 425 nm.


Cara Kerja :


25,0 ml blanko (aquadest)
25,0 ml standar
100,0 ml sampel (secara duplo)


  • + 1ml larutan ZnSO4 pada sampel
  • + 3 - 4 tetes larutan NaOH sampai terjadi endapan seperti awan
  • lalu ambil pada larutan tersebut (hanya bagian yang jernihnya saja) sebanyak 25,0
  • + 2 tetes larutan garam rhocele
  • lalu + 1ml larutan nessler pada blanko, standar, sampel
  • baca pada panjang gelombang 425 nm

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