JavaScript requeired.
Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Determination of polythionates in an active crater lake by nitrate ion-selective electrode

Yoshiko Fujiwara, Shinji Ohsawa, Kunihiko Watanuki, Bokuichiro Takano
Geochemical Journal, Vol. 22, No. 6, P. 249-256, 1988

ABSTRACT

A nitrate ion-selective electrode, Orion model 93-07, has been examined to determine in situ tri- to hexathionate in an active crater lake. The electrode (ISE) showed a linear response to aqueous polythionates within a range of 10-5-10-2M. The slope in the plot of log concentration vs electrode potential was slightly larger than the Nernst slope for S3O62-, S4O62- and S5O2-6, while a considerably larger one was observed for S6O2-6. Selectivity coefficients determined by the fixed interference method were k34pot=23, k45pot=10 and k56pot=7.0 for a pair of S3O2-6--S4O2-6, S4O2-6-S5O2-6 and S5O2-6-S6O2-6, respectively. The observed variation in the electrode potential for polythionate solution was best explained in terms of the Nicholsky-Eisenman equation. Chloride and sulfite ions less than 2500 ppm and 500 ppm, respectively, did not interfere with the potential measurement. The sum of three polythionates (tetra-plus penta- plus hexathionate) of volcanic origin determined by the ISE method has agreed well with those by the microbore column HPLC.

All Issues

Current Issue:
Stats:
Impact Factor: 1.561
Geochemical Society of Japan

page top