Spectrophotometric Method for the Determination of Small Amounts of Sulfate Ions

Abstract

The authors have devised a new method for the determination of small amounts of sulfate. Sulfate is precipitated as barium sulfate using barium chromate suspension in an acid solution (0.5 M acetic, 0.01 M hydrochloric acid), and the excess of barium is almost completely precipitated as barium chromate by adding ammonia water (containing calcium ion) and ethanol. Finally the amount of chromate which is exchanged with sulfate is estimated. The proposed method may be applicable to the determination of 0.3–100p. p.m. sulfate with satisfactory results.

Deposition of anthropogenic sulfate and Pb-210 in the western North Pacific area.

“…The filtered sample water was analyzed value and the average concentration in seawater, for chloride and sulfate by the colorimetric respectively. methods of, respectively, Iwasaki et al (1956) The deposition rates of sodium vary widely and Iwasaki et al (1957), and for sodium and with place and season (Fig. 1).…”

Flow injection spectrophotometry coupled with a crushed barium sulfate reactor column for the determination of sulfate ion in water samples*1

“…Several methods have been reported so far for the determination of sulfate ion; for examples, ion chromatography [1][2], flow injection analysis (FIA) [3][4][5][6][7][8] and sequential injection analysis (SIA) [9][10][11]. Conventional methods for the determination of sulfate ion in water samples are commonly based on formation of a barium sulfate suspension [12] and an anion exchange/spectrophotometry with either barium chromate [13][14] or barium chloranilate [14] as a solid reagent. A reaction unit was introduced into a flow injection method to accelerate the efficiency of the solid-liquid reaction [16].…”

Chemical characteristics of pond waters in the Labyrinth of southern Victoria Land, Antarctica

“…Spectrophotometry for low salinity (Iwasaki et al, 1957) and gravimetry for high salinity. F: Ion selective electrode method.…”