Method for trace analysis of impurity, and light absorption meas

Details Method for trace analysis of impurity, and light absorption meas Method for trace analysis of impurity, and light absorption meas

1995-06-07

1996-05-14

Housel, James C.

Chemistry: analytical and immunological testing

Optical result

436166, 436178, 436100, 436174, 422 8205, G01N 2175

Patent

active

055167012

ABSTRACT:
In an analytical method for trace amounts of silicic acid in pure water of the present invention, swollen gel which has been swollen with pure water sufficiently is used as granular solid which adsorbs colored silicic acid species. A small amount of swollen gel is aliquotted volumetrically, and then the gel is added to a sample solution. Colored silicic acid species is adsorbed and concentrated on a small amount of the granular solid. Therefore, trace amounts of silicic acid can be determined with high sensitivity.

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Yoshimura et al., "Ion-Exchanger Phase Absorptiometry for Trace Analysis", Talanta, 1985, vol. 32, No. 5, pp. 345-352.
Yoshimura et al., "Microdetermination of Silicic Acid in Water by Gel-Phase Colorimetry with Molybdenum Blue", Analytical Chemistry 1984, 56, pp. 2342-2345.
U. Hase et al., "Determination of Silicic Acid in Highly Purified Water by Improved Gel-Phase Absorptiometry", Analytical Sciences, Feb. 1993, 9, pp. 111-115.

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