| 摘要 |
PROBLEM TO BE SOLVED: To provide a mercury concentration measurement device which can easily obtain reduced and vaporized state of mercury in a sample solution when mercury is collected as gold amalgam.SOLUTION: After adding a sample solution and a 10% stannous chloride solution in a reduction and vaporization unit 1, and when air is controlled to flow into the reduction and vaporization unit 1 via a mercury removal filter 10, a mercury vapor vaporized by bubbling processing is conveyed to a re-collection mercury collecting tube 5 via an acid mist remover 2, a water remover 3, and an absorption cell 41. At this time, as the temperature of the re-collection mercury collecting tube 5 is maintained as 150°C, the reduced and vaporized mercury vapor is collected by a collection agent of the re-collection mercury collecting tube 5, on the other hand interference components other than the mercury vapor are not collected and are discharged. During the mercury collection, a control unit 12 acquires light absorption signals detected by a mercury detection unit 4, and when the acquired light absorption signal has almost the same signal strength as the signal at measurement start, the control unit 12 determines that reduction and vaporization reaction has terminated, and stops driving an air pump 9 to terminate collection of gold amalgam. |
