NTA

 Nitrilotriacetic acid, trisodium salt, monohydrate

 

Mol. Wt. 275

 Physical Properties of NTA

 White crystalline powder
 Minimum assay of 99.0%
 Bulk density of 0.65-0.78 g/cc
 Solubility at 25°C = 48.4%
 Not readily flammable
 pH of 1% solution = 10.5-11.7
 Hygroscopic
 - will start to pick up water at >70% R.H. 

 NTA is Economical Sequestrant

 Parts Chelant Required to Control One Part Metal

 Metal

 NTA

 EDTA

 STP

 Aluminum

 10.2

 14.1

 13.6

 Calcium

 6.9

 9.5

 9.2

 Copper

 4.3

 6.0

 5.8

 Iron

 4.9

 6.8

 6.6

 Magnesium

 11.3

 15.6

 15.1

 Manganese

 5.0

 6.9

 6.7

 Zinc

 4.2

 5.8

 5.6

 Physical Properties of NTA