| ≥1 piece |
|
Sensory indexes |
Item |
Index |
|
Superior class |
||
|
Color |
Pure white |
|
|
Smell |
no objectional odor |
|
|
Taste |
No sand |
|
|
Impurity |
No foreign substance |
|
|
Physiochemical index |
moisture% |
18.00-20.00 |
|
Ash content ,( dry basis ) %≤ |
0.30 |
|
|
Protein ,( dry basis ) %≤ |
0.10 |
|
|
spot , /c ? ≤ |
3.00 |
|
|
fineness , 150um(100mesh)passing rate , % ( w/w ) ≥ |
99.90 |
|
|
Whiteness , 457nmblue light reflexs rate , %≥ |
92.0 |
|
|
viscosity , 4% ( dry matter count ) 700cmg,BU≥ |
1300 |
|
|
conductivity , us≤ |
100 |
|
|
PH Value |
6.0-8.0 |
|
|
Health indicators |
Sulfur dioxide , mg/kg≤ |
10 |
|
arsenic(As) , mg/kg≤ |
0.30 |
|
|
Pb ( Pb ), mg/kg≤ |
0.50 |
|
|
aerobic bacterial count , cfu/g≤ |
5000 |
|
|
Mold and yeast count , cfu/g≤ |
500 |
|
|
coliformsMPN/100g≤ |
30 |