Nuclear magnetic resonance spectroscopy is one that studies the spin changes at the nuclear level. This is done when a radio frequency energy is absorbed...
Limit test for iron is done to check if the level of iron impurities are withint the standard limits. It is done by generation of color by thyoglycolic acid...
Limit test for sulphates is based on precipitation of sulphate ions by barium chloride reagent. The test sample's turbidity is compared with the standard....