| 摘要 |
1364974 Determination of mercury OLIN CORP 4 Feb 1972 [16 Feb 1971] 5339/72 Heading G1B A method for automatically monitoring a fluid for the content of mercury present therein by programming and mechanically performing successively and repetitively the operations of: (a) providing aqueous hydrazine reagent in a first reagent zone and metal salt solution in a second reagent zone, the metal salt solution being convertible by the aqueous hydrazine reagent to a metal oxide (but not to a metal which is capable of amalgamating with metallic mercury) (b) removing from said first reagent storage zone a hydrazine reagent portion of predetermined amount and transferring said hydrazine reagent portion to a scrubbing zone; (c) removing from said second reagent storage zone a metal salt reagent portion of predetermined amount and transferring said metal salt reagent portion to said scrubbing zone; (d) scrubbing said reagent portions in said scrubbing zone with a gaseous carrier; (e) separating said gaseous carrier from the resulting aqueous mixture in said scrubbing zone; (f) transferring said carrier to a pyrolyzing zone and pyrolyzing said carrier and admixed components to remove interfering material from said gaseous carrier; (g) transferring said carrier to a measuring zone and automatically adjusting the base line reading to zero; (h) providing a fluid to be monitored for mercury therein: (i) removing from said fluid a sample of predetermined amount and transferring said sample to said scrubbing zone; (j) scrubbing the resulting mixture of said sample with said aqueous mixture in said scrubbing zone with said carrier; (k) separating said gaseous carrier from the resulting aqueous liquid in said scrubbing zone; (1) transferring said carrier to a pyrolyzing zone and pyrolyzing said carrier and admixed components to remove interfering material from said gaseous carrier; (m) transferring said carrier to said measuring zone and photo-metrically measuring the quantity of mercury in said carrier; and (n) indicating the quantity of mercury in said carrier relative to the predetermined amount of said sample. Suitable metal salts are those of copper, nickel and titanium. Apparatus for use in the process may be operated under applied pressure or reduced pressure. In the process the mercury compounds are reduced to metallic mercury: this may be determined by absorption at 2537 Š. |
