Online automatic monitoring system of total nitrogen and total phosphorus in seawater and monitoring method thereof
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An automatic monitoring and seawater technology, applied in the field of marine environment monitoring, can solve the problems of inability to meet the requirements of on-board on-site testing, cumbersome, can only be completed in the laboratory, and not suitable for on-site monitoring, etc., to achieve reliable performance, high sensitivity, and easy operation convenient effect
Inactive Publication Date: 2010-02-24
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Since total phosphorus and total nitrogen are digested and measured separately, the digestion time of this method is long and the operation is cumbersome. It can only be completed in the laboratory, which cannot meet the requirements of on-site testing on board, and is not suitable for on-site monitoring of sudden pollution accidents.
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Embodiment 1
[0084] Embodiment 1, online monitoring of total nitrogen in seawater:
[0085] 1. Seawater digestion:
[0086] The seawater sample, digestion agent, zero drift solution, and standard solution are connected to the digestion device 4 through the proportional distribution valve and the plunger pump. The seawater sample is injected into the digestion device, and gradually rises to 125°C within 200s, and the power of the ultraviolet lamp is 40W. , digested at this temperature for 780s, and the sample after digestion flows into the electronic condenser 5 to cool down;
[0087] 2. Determination of total nitrogen in seawater:
[0088] 2-1. Reducing nitrate in a part of the digested seawater sample to nitrite:
[0089] 2-1-1. Rinsing of cadmium reduction column
[0090] Start the peristaltic pump (7-1), inject ammonia-free carrier liquid into the cadmium reduction column, and then turn the four-way valve to empty the ammonia-free carrier liquid;
[0091] 2-2-2. Restore
[0092] Th...
Embodiment 2
[0107] Embodiment 2, online automatic monitoring of total phosphorus in seawater:
[0108] 1, seawater digestion is identical with the step 1 of embodiment 1;
[0109] 2. The other part of the digested sample is mixed with the orthophosphate chromogenic agent at the three-way valve 10 under the carrier liquid without ammonia, and the three are mixed evenly in the sample reaction pipeline 11-2 at the back, and enter the spectroscopic The absorbance was measured with a photometer. The assay method is the same as step 2-2-3 of Example 1.
[0110] The above description is only proposed as an implementable technical solution of the online automatic monitoring system and monitoring method of total nitrogen and total phosphorus in seawater of the present invention, not as a single restriction on the structure itself.
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Abstract
The invention provides an online automatic monitoring system of total nitrogen and total phosphorus in seawater and a monitoring method thereof. The system comprises an automatic seawater liquid feedcontroller, an ultraviolet microwave digestor, a total nitrogen measuring flow passage, a total phosphorus measuring flow passage and a spectrophotometer, wherein the automatic seawater liquid feed controller is connected with the ultraviolet microwave digestor by a liquid feed pipeline; digested sample flows into an electronic cooler from a liquor drainage pipeline of the ultraviolet microwave digestor to be cooled and respectively enters into the total nitrogen measuring flow passage and the total phosphorus measuring flow passage; the total nitrogen measuring flow passage comprises a nitrate ion reducing device, a sample reaction pipeline is connected with the spectrophotometer, and the front end of the sample reaction pipeline is provided with a nitrite color reagent injecting valve; and the total phosphorus measuring flow passage comprises the structure that the sample reaction pipeline is connected with the spectrophotometer, and the front end of the sample reaction pipeline is provided with an orthophosphate color reagent injecting valve. The invention can complete work procedures such as automatically sampling seawater, digesting, reducing, washing, measuring, and the like,at one time.
Description
technical field [0001] The invention relates to an online automatic monitoring system and monitoring method for total nitrogen and total phosphorus in seawater, which is suitable for fast online automatic determination of total nitrogen and total phosphorus in seawater under the condition of providing pretreated seawater samples, and belongs to Marine environment monitoring technology field. Background technique [0002] At present, phosphorus and nitrogen are one of the main nutrients in seawater, and excessive nitrogen and phosphorus will lead to eutrophication of water bodies. Determination of total phosphorus and total nitrogen in seawater With the advancement of science and technology, the marine environment monitoring technology is developing from manual sampling laboratory analysis to ship-borne automatic monitoring and intelligent and network-based monitoring. However, the detection methods for total phosphorus and total nitrogen in seawater stipulated in the "Marin...
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