Chemical Requirements for Tea

Characteristic Requirement Method of Test Ref. No.
Water extract, percent by mass, Min 32.0 IS 13862
Total ash, percent by mass 4.0 – 8.0 IS 13854
Water soluble ash, water of total ash, percent by mass, Min 4.0 IS 13855
Alkalimity of water soluble ash (as K2O), percent by mass 1.0 – 2.2 IS 13856
Acid insoluble ash, percent by mass, Max 1.0 IS 13857
Crude fibre, percent by mass, Max 17.0 IS 10226 (Pt 1)
Lead, mg / kg, Max 10.0 IS 12074 32.0 IS 13862
Copper , mg / kg, Max 150.0 IS 11123 32.0 IS 13862

Pesticide Residue Limits for Tea (See also Pesticide Residues)

1 Dicofol, mg / kg, Max 5.0 IS 14629
2 Ethion, mg / kg, Max 5.0 IS 11773
3 Quinolphos, mg / kg, Max 0.01 IS 14437