(Introduction)
Methods
Reagents
Standard solutions
Treatment of apparatus
Determination of phosphate
Beer's law and reproducibility
Salt error
Interferences
『Summary
It has been found that a reagent containing sulphuric acid,
ammonium molybdate and ascorbic acid may be used as a single-solution
reagent for the determination of phosphate in sea water. Development
of the molybdenum-blue colour is complete in 24 h at room temperature
and in 30 min at 60℃; the colour is stable for at least 3 days.
Beer's law is obeyed closely up to at least 500μg PO43--P/l.
The salt error is approximately 4％ with sea water of chlorinity
19.3％. The interference due to either arsenate or silicate at
their concentrations in sea water is negligible.』
References