| 摘要 |
1501108 Monitoring boiler feed water UNITED KINGDOM ATOMIC ENERGY AUTHORITY 2 June 1975 [7 June 1974] 25458/74 Heading G1B [Also in Division C7] Ion concentrations below levels suitable for direct measurement are detected in a flowing liquid by tapping an isokinetic sample therefrom and passing it across one face of a porous neutral membrane of pore size 0À2-1 micron across which is applied a D.C. voltage which attracts the ions of interest through the membrane into a volume of liquid (initially ion free) on its other side, the accumulated ion-concentration in which is measured when it is high enough, and the value obtained being then related to the liquid flow. Chloride in boiler-feed water may be detected, the ion-free liquid being derived from a steam condensate well and being optionally de-ionized by electrolysis identically to the sample liquid. Chloride concentrations below 1 Ág/l are detectable. The ion-free liquid may flow or be static. Continuous monitoring using colorimetric detection is specified |
