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Jumat, 09 Desember 2011

Pemeriksaan Bilangan Peroksida / Tingkat Ketengikan

Praktek Kimia AMAMI
Bilangan Peroksida / Tingkat Ketengikan

Tujuan : 
Untuk mengetahui kadar bilangan peroksida dalam minyak dam margarin

Metode : Yodometri

Reagen : 
As.asetat : chloroform
As.asetat alkohol : choloform 
0,2gram KI
larutan Na2S2O3 (Natrium Thiosulfat) 
indikator amylum

Cara Kerja :

Kadar Bilangan Peroksida dalam Minyak (lakukan secara duplo)
·         Ambil sampel minyak dengan menggunakan spatula ± 1gram
·         Tambahkan 6 mL reagen  As.asetat : chloroform
·         Tambahkan 0,2 gram KI, diamkan selama 1 menit
·         Tambahkan 10 mL aquadest bebas CO2
·         Tambahkan 3 - 5 tetes indikator amylum
·         Titrasi dengan AgNa2S2O3 / lar.thiosulfat 0,0227 N sampai warna menjadi biru hilang

Kadar Bilangan Peroksida dalam Margarin (lakukan secara duplo)
·         Ambil sampel margarin dengan menggunakan spatula ± 1gram
·         Tambahkan 6 mL reagen  As.asetat alkohol : chloroform
·         Tambahkan 0,2 gram KI, diamkan selama 1 menit
·         Tambahkan 10 mL aquadest bebas CO2
·         Tambahkan 3 - 5 tetes indikator amylum
·         Titrasi dengan AgNa2S2O3 / lar.thiosulfat 0,0227 N sampai warna menjadi biru hilang


                                                 Rumus Perhitungan Bilangan Peroksida :

                                                  m (tio.Vt) x N.tio x 8 x 1000  = ..... Mg/Kg
                                                        Baerat sampel

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