Dh,
Mas Gio, mungkin Saya akan berikan 2 alternative uji kualitatif utk
Formalin (mengandung 36% Formaldehyde) dlm makanan khususnya Milk & bisa
diterapkan juga pd Sampel Solid & Semi Solid lainnya.
First Method :
HEHNER'S TEST :
Sampel (sampel susu) dilarutkan/diencerkan dgn air dan didestilasi
perlahan. Lalu didestilat diasamkan dgn Asam Phosphat. Ambil 2 mL
Destilat dan campurkan dgn 2 mL susu dlm tabung reaksi. Tuangkan Asam
Sulfat (90% berisi sedikit FeCl3) mll samping tabung. Formaldehyde
(+) bila berwarna Violet pd perbatasan lapisan. Warna Violet tdk
terbtk jika kandungannya cukup besar.
Second Method :
SHREWSBURY & KNAPP'S TEST :
Buat reagen dgn campuran 100 mL HCl (p) dan 0.1 mL HNO3(p). Campurkan
5 mL spl Susu dgn 10 mL reagen dan panaskan dlm air 50oC selama 5 mnt.
Formalin (+) bila tbtk warna PURPLE.
Demikian, Thanks. Jika ada yg ditanyakan bisa Call Saya lagi by e-mail or
phone OK.
Wassalam
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