Geology topics

C. A. Kinser

Publications and source records attributed to C. A. Kinser.

2 recordsLinked to original sources

USGS2002

Dithizone method for determination of lead in monazite

In the determination of lead in monazite-to be used as the basis for geologic age measurements-it was necessary to eliminate interferences due to the presence of phosphates of thorium and the rare earth metals. The method involves attacking the monazite samples with hot, concentrated sulfuric acid, then taking them up with dilute nitric acid. Lead is extracted as the dithizonate and determined spectrophotometrically at 520 mµ. Rapid determinations were made with good reproducibility on a series of monazite samples.

Analytical Chemistry↗

USGS1956

A dithizone method for the determination of lead in monazite

In determining lead in monazite [(Ce,La,Th)PO 4 ]--to be used as the basis for geologic age measurements--it was necessary to eliminate interferences due to the presences of phosphates of thorium and the rare-earth metals. The method, in which monazite samples are attacked with hot concentrated sulfuric acid, taken up with dilute nitric acid, lead extracted as the dithizonate and then determined spectrophotometrically at 520 mμ, was successfully applied to a series of monazite samples. Rapid determinations were made with good reproducibility.

Trace Elements Investigations↗