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A phosphate (PO3−4) is an inorganic chemical and a salt-forming anion of the phosphoric acid. Inorganic chemistry, a phosphate, or organophosphate, is an ester of phosphoric acid. Of the various phosphoric acids and phosphates, organic phosphates are important in biochemistry and biogeochemistry, also called ecology, and inorganic phosphates are mined to obtain phosphorus for use in agriculture and industry. At elevated temperatures in the solid state, phosphates can condense to form pyrophosphates.

Hydrazine Hydrate is commonly used has Oxygen Scavenger in Hp and LP Boiler. The measurement of dissolved oxygen in boiler plants plays a vital role if the plant is to run efficiently and to be cost effective, with minimum down time. Even small quantities of dissolved oxygen in boiler water are capable of causing severe pitting in boilers of all pressures, and will reduce the boiler life dramatically. In boilers where high chloride levels exist, the effect of oxygen corrosion is increased. Therefore, the need to reduce dissolved oxygen content to a very low level is even more important.

A chemist from Medieval Latin alchemists is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties. Chemists carefully describe the properties they study in terms of quantities, with detail on the level of molecules and their component atoms. Chemists carefully measure substance proportions, reaction rates, and other chemical properties. The word 'chemist' is also used to address Pharmacists in Commonwealth English.