| 摘要 |
1509391 Measuring carbon content electrically SYBRON CORP 23 Dec 1975 [6 Feb 1975] 52691/75 Headings G1B and G1N The amount of organic carbon in an aqueous media is detected by converting the carbon into carbon dioxide by irradiating the media with ultraviolet radiation and measuring the amount of carbon dioxide produced. A dissolved sample is introduced by means of syringe into inlet 35a of a first water loop 9 which includes an irradiation chamber 1 containing an ultraviolet lamp 3 and a pump 7 so that the sample is circulated into the chamber 1 and any carbon present is converted into CO 2 which is drawn through a closed air loop 31 into a measuring chamber 11 incorporating a resistivity measuring cell by means of an eductor 33. The output of the cell representative of the amount of C02 is then fed to a non-linear amplifier which converts the input voltage to the -1À414 power which is a measure of the organic carbon present in the sample, Fig. 2 (not shown). In operation, before a sample is added to the water loop a valve 25 in a second water loop 19 is opened so that water from chamber 1 passes through a mixed bed ion-exchanger 27 for purification, measuring chamber 11 to chamber 1. When the output of the resistance cell 15 indicates no further change valve 25 is changed over by means of a timer circuit, Fig. 3 (not shown), to isolate the liquid of chamber 1 from 11 and the sample is introduced. After a predetermined time the meter reading is taken and the cleaning operation repeated. |
