CN1158991A

CN1158991A - Water quality and hardness measuring method

Info

Publication number: CN1158991A
Application number: CN 96120799
Authority: CN
Inventors: 杨铸; 孙原
Original assignee: Beijing Physichemistry Analysis & Measurment Centre
Current assignee: Beijing Physichemistry Analysis & Measurment Centre
Priority date: 1996-11-29
Filing date: 1996-11-29
Publication date: 1997-09-10
Anticipated expiration: 2016-11-29
Also published as: CN1045019C

Abstract

Based on the colorimetric sbustitution principle adopting flow injection of EDTA and through computer control, the creeping pump via six-way valve pumps sample liquid from sampling cylinder, standard sample liquid from the standard sample liquid cylinder, blank water from the blank water cylinder,d eveloper from the developer cylinder and fading agent from the fading agent cylinder into mixing container; the mixed and deaired liquid mixture is measured at strong light in color comparator; and under the control of computer the measurement result is displayed and printed with the alarm sounding for water sample beyond standard. The present invention can perform multiple channel in-situ measurement of softened water and realize automatic measurement.

Description

Water quality and hardness measuring method

The present invention relates to the liquid testing method, refer more particularly to the method for testing of water hardness.

Water hardness is a kind of overall target of weighing alkaline-earth metal ions content in the water, if alkaline earth ion exceeds standard, water hardness is big, make gyp easily, influence the safe operation of boiler, so will soften processing to the water that enters boiler, so that reduction water hardness, and carry out hardness test for the water after softening is necessary, at present, method of testing for water hardness is a lot, but all be to take a sample in the water route after softening to take back to adopt electrode potential method or EDTA manual titration method to test in the laboratory, electrode potential method test error is big, electrode life is short, and EDTA manual titration method splashes into indicator and carries out reaction test in the water, operate cumbersome, test result is by artificial grasp, cannot say for sure to demonstrate,prove its accuracy, and these methods all can not be carried out on-the-spot on-line testing, and U.S. HACH company adopts the colourimetry that flows to monitor the water hardness of one-level water softener tank at the water hardness on-line determination instrument of market sale, and warning can exceed standard, but can not show concrete hardness number, and can only carry out the test of one-level jar, and the test of secondary jar must detect regularly manually also, can not realize the automatic test and the control of softening water.

The objective of the invention is to propose a kind of water hardness on-line testing method, this method is while or independent softening water hardness of testing one-level jar and secondary jar accurately at the scene, test data is handled automatically, the water sample warning that exceeds standard, test result shows and prints, and can realize the test control robotization of softening water.

The objective of the invention is to realize by following method: adopt flow injection EDTA displacement colorimetric principle, its step comprises:

(1) at the one-level jar of softening water and the water delivering orifice of secondary jar sample can is set respectively, will softens the water sample liquid pipeline and introduce in the sample can.

(2), and charge into corresponding liquid respectively at test site set up standard sample flow container, blank water pot, developer jar, stripping agent jar.

(3) adopt peristaltic pump by pipeline, electronic six-way valve, electric T-shaped valve, the liquid in above-mentioned each jar sucked the two-stage mixing tee respectively, carry out twice mixing after, enter colorimetric system through the degassing and carry out light intensity test.

(4) above-mentioned peristaltic pump, electronic six-way valve, electric T-shaped valve and colorimetric system are controlled automatically by single card microcomputer, and carry out the processing and the reference memory of test data.

(5) single card microcomputer is also controlled display, printer, realizes that test data shows that test result is printed automatically, and softening aqueous humor exceeds standard, and then controls scene or long-distance alarm apparatus and reports to the police.

Because the present invention has adopted above-mentioned flow injection EDTA method of replacing, collection test chemical technology, liquid tranmission techniques, ray machine power technology and computer intellectual technology are one, softening water is carried out online water quality and hardness measuring, realized multi-channel test, test result is accurate, and is simple to operate, test data is handled automatically, test result automatically shows or prints, and the water hardness warning that exceeds standard has realized the automatic monitoring and the control of softening water hardness.

Below by embodiment in detail the present invention is described in detail in conjunction with the accompanying drawings also

Fig. 1 is a schematic flow sheet of the present invention

In embodiments of the present invention, sample can 4,10 is set, standard specimen flow container 14, blank water pot 15 developer jars 16, stripping agent jar 17, and charge into corresponding liquid respectively, electronic six road valves 12 also are set, electric T-shaped valve 13, peristaltic pump 18, mixing tee 26, degassing threeway 25, colorimetric system 26, single card microcomputer 27, display 28 and printer 29.

It is as follows that Fig. 1 demonstrates this method step: the softening water of one-level jar 1 is introduced in the sample can 4 by pipeline 2 in the water softening system, the softening water of secondary jar 7 is introduced in the sample can 10 by pipeline 8, sample can 4,10 li unnecessary water are by evacuated tube 11,9 discharge, single card microcomputer 27 electronic six-way valve 12 of automatic start-up control and electric T-shaped valves 13, seek the outlet 3 that the position turns to sample can 4 by pipeline 5, single card microcomputer 27 is controlled peristaltic pump 18 simultaneously and is rotated, with the softening water in the sample can 4, magnesium sulphate standard sample liquid in the standard sample flow container 14, blank water in the blank water pot 15, after being undertaken mixing the first time by electronic six-way valve 12 and electric T-shaped valve 13 suction to one-level mixing tee 19, enter secondary mixing tee 20 through flexible metal conduit 21, the ethylenediamine tetracid of extracting out from developer jar 16 simultaneously with peristaltic pump 18 two is received the salt developer and blue K of acid network and the magnesium sulfate mixed solution stripping agent extracted out from stripping agent jar 17 enter secondary mixing tee 20 jointly through flexible metal conduit 22, carrying out the second time mixes, after twice mixed mixed liquor is through degassing threeway 25 degassings, enter colorimetric system 26 through single card microcomputer 27 control break-makes, carrying out light intensity measures: and the bubble in the mixed liquor is by

gas outlet

23,24 discharge, and enter the mixed liquor of colorimetric system 26; Through the irradiation of halogen lamp light intensity, utilize the absorbance of mixed liquor, determine water hardness, measurement result shows by display 28.

After finishing the softening water test in the sample can 4, the electronic six-way valve 12 of single card microcomputer 27 controls is sought an outlet 6 that is diverted to sample can 10 and is repeated above-mentioned testing procedure, finish the softening water test of sample can 10 after single card microcomputer 27 compares twice test result automatically, exceed standard as water hardness, single card microcomputer 27 is reported to the police sky system scene or long-distance alarm apparatus.

After all test is finished, after single card microcomputer 27 carries out parameters memorizing, close peristaltic pump 18 and colorimetric system 26 and control printer 29 and print test result of calculation and detection time.

The working routine of the present invention by adjusting single card microcomputer be the softening hardness in arbitrary jar in the test sample jar 1,10 separately also.

Claims

A kind of water quality and hardness measuring method, its step comprises:

(1) water delivering orifice at softening water one-level jar (1) and secondary jar (7) is provided with sample can (4) respectively (l0), and will soften aqueous humor and introduce in the sample can (4) (10) (2) (8) by the road,

(2) at the test site sample flow container (14) that sets up standard, blank water pot (15), developer jar (16), stripping agent jar (17), and charge into corresponding liquid respectively

(3) adopt peristaltic pump (18) by pipeline (5), electronic six-way valve (12), electric T-shaped valve (13) sucks two-stage mixing tee (19) (20) respectively with the liquid in above-mentioned each jar, carry out twice mixing after, after degassing threeway (25) degassing, enter colorimetric system (26) and carry out light intensity test

(4) above-mentioned peristaltic pump (18), electronic six-way valve (12), processing and the parameters memorizing of hugging certificate controlled and tested to electric T-shaped valve (13) and colorimetric system (26) automatically by single card microcomputer (27),

(5) single card microcomputer control display (28), printer (29) realize that test data shows that test result is printed automatically, and softening aqueous humor exceeds standard and then controls scene or long-distance alarm apparatus warning.