1953 Volume 17 Issue 9 Pages 450-452
In the photometric determination of arsenic with molybdenum blue, phosphorus shows the same absorption as arsenic. Therefore, the determination of pure arsenic was studied after the separation of phosphorus from arsenic. Before the reduction to molybdenum blue, phosphorus in the form of molybdate compound was extracted with organic solvents, but not arsenic. This treatment was applid to the photometric determination of arsenic, and satisfactory results were obtained.