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High pressure flow injection water quality total phosphorus analysis system

A technology of flow injection and analysis system, which is applied in the field of high-pressure flow injection water quality total phosphorus analysis system, can solve the problems of difficulty in improving detection accuracy, inability to apply automatic water quality online detection, etc., and achieves no bubble interference, increased damping, and high detection accuracy. Effect

Inactive Publication Date: 2008-12-10
DELIN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] At present, molybdenum blue spectrophotometry mostly uses manual detection, the detection accuracy is difficult to improve, and it cannot be applied to online automatic detection of water quality

Method used

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  • High pressure flow injection water quality total phosphorus analysis system
  • High pressure flow injection water quality total phosphorus analysis system
  • High pressure flow injection water quality total phosphorus analysis system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 This system is used for the detection process of water quality total phosphorus

[0036] 1. Preparation of Reagents

[0037] 1-1. Preparation of chromogenic agent molybdate solution (RMo):

[0038] Dissolve 10g ammonium molybdate [(NH 4 ) 6 Mo 7 o 24 .4H 2 O] in 100mL of water. Dissolve 0.10 g potassium antimony tartrate [KSbC 4 h 4 o 7 .H 2 O] in 100mL of water. Slowly add ammonium molybdate solution to 44mL sulfuric acid (1+1) under constant stirring, then add antimony potassium tartrate solution, make the volume to 500ml, and then mix evenly to obtain color developer RMo.

[0039] 1-2. Preparation of carrier fluid ascorbic acid (RVc)

[0040] Dissolve 25g of ascorbic acid (C 6 h 8 o 6 ) in water and diluted to 1L.

[0041] 1-3. Preparation of digestion agent potassium persulfate

[0042] 25g potassium persulfate (K 2 S 2 o 8 ) in dry water and dilute to 1L.

[0043] 2. System cleaning

[0044] 2-1. Turn on the heater to 110°C and ke...

Embodiment 2

[0074] Embodiment 2 This system is used for the test accuracy test of low phosphorus water quality

[0075] Sample 1 and Sample 2 with known phosphorus content were used as test objects. Heating temperature: 110°C, L S The length of the sampling loop is 200mm, and the concentration of the carrier liquid is 25g / L. Measure standard sample 1 and standard sample 2 and sample 1 and sample 2 by the method for embodiment 1, measure baseline, peak value, absorbance value respectively, and obtain the phosphorus content test value of sample 1 and sample 2, list in the following table :

[0076]

Embodiment 3

[0077] Embodiment 3 This system is used for the testing accuracy test of high phosphorus water quality

[0078] In order to adapt to the measurement of water bodies with higher concentrations, L S The length of the sampling loop is 150mm, and the other conditions are the same as above. Taking samples 3 and 4 with known phosphorus content as test objects, standard samples 3 and 4 were used for calibration first.

[0079] The measured data are as follows:

[0080]

[0081] The above two groups of experiments show that the error between the total phosphorus concentration of the sample measured by this method and the actual concentration of the sample is extremely small, indicating that this system can achieve high accuracy when used in the analysis of total phosphorus in water quality.

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Abstract

The invention relates to a high pressure flow injection water quality total phosphorus analyzing system which comprises a heater, a cooler, a photoelectric circulation pool, a digestion agent storing bottle, a sample injection pump, a loading solution injection pump and a chromogenic reagent peristaltic pump which are connected into a system through capillary pipes and a plurality of conversion valves. A solution storing pipe, a quantitative ring and a prolonged back press pipe are connected among the valves. The flowing ways of the system are changed through the conversion of the valves. With the flowing injection way adopted y the system, the steps of molybdenum blue spectrophotometric method for determining phosphorus of water samples and various reagents are automatically and orderly finished in the continuously flowing system. The system has the advantages of simple structure, rapid determination process, convenient operation, accurate quantity, bubble interfere-free performance and high detection precision and is especially applied to the online analyzing total phosphorus in surface water, wastewater and industrial wastewater, thereby realizing the online monitoring on the content of water phosphorus.

Description

technology field. [0001] The invention relates to a water quality total phosphorus analysis system, in particular to a high-pressure flow injection water quality total phosphorus analysis system, which is used for online detection of phosphorus content in tap water, river, lake water, industrial sewage and other waste water. technical background [0002] Phosphorus is widely distributed in nature. In fresh water and seawater, the average content of phosphorus is 0.02mg / L and 0.088mg / L, respectively. Due to the strong ability of phosphorus to bind oxygen, phosphorus exists almost in the form of various phosphates, including orthophosphate, condensed phosphate (pyrophosphate, metaphosphate and polyphosphate) and organic-bound phosphate It exists in natural water and waste water in the form of solution or suspension. [0003] There are many sources of phosphate in water. For example, after the use of phosphate fertilizers and pesticides, phosphate will be brought into surface ...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N35/08
Inventor 洪陵成
Owner DELIN ENVIRONMENTAL PROTECTION TECH
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