NHOM HYDROXYD KHO  

Aluminii hydroxydum siccum

Nhom hydroxyd kho la nhom oxyd ngam nc, phai cha t 47,0 en 60,0% Al2O3 (P.t.l: 102,0).

Tnh chat  

Bot trang vo nh hnh.

Thc te khong tan trong nc, tan trong cac acid vo c loang va trong cac dung dch hydroxyd kiem.

nh tnh  

Dung dch S: Hoa tan 1,25 g che pham trong 7,5 ml acid hydrocloric (TT) bang cach un nong tren cach thuy va pha loang vi nc thanh 50 ml.

Dung dch S phai co phan ng cua ion nhom (Phu luc 8.1).

o trong va mau sac cua dung dch  

Dung dch S khong c uc hn hon dch chuan oi chieu so II (Phu luc 9.2) va mau khong c am hn mau mau VL6 (Phu luc 9.3, phng phap 2).

Gii han kiem  

Lac 1,0 g che pham vi 20 ml nc khong co carbon dioxyd (TT) trong mot phut va loc. Them vao 10 ml dch loc, 0,1 ml dung dch phenolphtalein (TT). Dung dch neu co bat ky mau hong nao cung phai mat mau khi cho them 0,3 ml dung dch acid hydrocloric 0,1 M (C).

Kha nang trung hoa  

Tien hanh phep th 37 oC.

Hoa tan 0,5 g che pham trong 100 ml nc, un nong, them 100,0 ml dung dch acid hydrocloric 0,1 M (C) a c lam nong trc va khuay lien tuc. pH cua dung dch sau 10 phut, 15 phut va 20 phut khong c di 1,8; 2,3 va 3,0 va bat ky thi iem nao cung khong c qua 4,5. Them 10,0 ml dung dch acid hydrocloric 0,5 M (C) a c lam nong trc, khuay lien tuc trong mot gi va chuan o bang dung dch natri hydroxyd 0,1 M (C) en pH 3,5. Lng dung dch natri hydroxyd 0,1 M (C) a dung khong c qua 35,0 ml.

Clorid  

Khong c qua 1% (Phu luc 9.4.5).

Hoa tan 0,1 g che pham trong 10 ml dung dch acid nitric loang (TT) bang cach lam nong va pha loang vi nc thanh 100 ml. Lay 5 ml dung dch nay, pha loang vi nc thanh 15 ml va tien hanh th.

Sulfat  

Khong c qua 1% (Phu luc 9.4.14).

Pha loang 4 ml dung dch S vi nc va pha loang thanh 100 ml vi cung dung moi. Lay 15 ml dung dch nay tien hanh th.

Arsen  

Khong c qua 4 phan trieu (Phu luc 9.4.2).

Lay 10 ml dung dch S tien hanh th theo phng phap A.

Kim loai nang  

Khong c qua 60 phan trieu (Phu luc 9.4.8).

Trung hoa 10 ml dung dch S bang amoniac am ac (TT), dung dung dch vang metanil (TT) lam ch th ngoai. Loc neu can roi pha loang vi nc thanh 15 ml. Lay 12 ml dung dch nay tien hanh th theo phng phap 1. Dung 10 ml dung dch ch mau 1 phan trieu (TT) e chuan b mau oi chieu.

o nhiem khuan  

Tong so vi khuan hieu kh song lai c khong c qua 1000 trong mot gam che pham. Xac nh bang phng phap a thach (Phu luc 13.6).

Che pham phai at cac yeu cau ve Enterobacteria, cac vi khuan Gram am khac va Escherichia coli (Phu luc 13.6).

nh lng  

Hoa tan 0,800 g che pham trong 10 ml dung dch acid hydrocloric 25% (TT) bang cach un nong tren cach thuy. e nguoi va pha loang vi nc thanh 50,0 ml. Them vao 10,0 ml dung dch nay dung dch amoniac 6 M (TT) cho ti khi bat au xuat hien tua. Them mot lng toi thieu dung dch acid hydrocloric loang (TT) can thiet e hoa tan tua va pha loang vi nc thanh 20 ml. Tien hanh chuan o nhom theo phng phap chuan o complexon (Phu luc 10.5).

1 ml dung dch natri edetat 0,1 M (C) tng ng vi 5,098 mg Al2O3.

Bao quan  

Trong o ng kn, nhiet o di 30 oC.

Loại thuốc

Khang acid da day.