CN202903673U - Full-automatic quick water quality measuring system with hexavalent chromium - Google Patents
Full-automatic quick water quality measuring system with hexavalent chromium Download PDFInfo
- Publication number
- CN202903673U CN202903673U CN 201220621188 CN201220621188U CN202903673U CN 202903673 U CN202903673 U CN 202903673U CN 201220621188 CN201220621188 CN 201220621188 CN 201220621188 U CN201220621188 U CN 201220621188U CN 202903673 U CN202903673 U CN 202903673U
- Authority
- CN
- China
- Prior art keywords
- interface
- communicated
- full
- water quality
- way valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Measuring Cells (AREA)
Abstract
The utility model relates to a full-automatic quick water quality measuring system with hexavalent chromium. A first electromagnetic valve is connected with a standard hexavalent chromium solution and a second electromagnetic valve and is also connected to a first connector of a six-way valve by a peristaltic pump, the second electromagnetic valve is connected with a standard sample, a second connector and a fifth connector of the six-way valve are connected by a quantitative loop, a sixth connector of the six-way valve is connected with waste liquid, a third connector of the six-way valve is connected to a current-carrying solution by the peristaltic pump, a fourth connector of the six-way valve is respectively connected with one end of a reaction tube and a developing agent flowing through the peristaltic pump by a three-way mixer, and a third electromagnetic valve is respectively connected to the other end of the reaction tube and air and is also connected to the water liquid by a photoelectric detection device. The full-automatic quick water quality measuring system provided by the utility model has the advantages that the flow path design is simple, pure digitalized photoelectric detection is adopted, the interference of bubbles is eliminated and the like; and by virtue of a PLC (programmable logic controller), the failure rate of an instrument control system is greatly reduced, and the unattended full-automatic determination of the measuring system is truly realized.
Description
Technical field
The utility model relates to sexavalent chrome measuring system in a kind of environmental water sample, particularly relates to the full-automatic Fast measurement system of a kind of water quality sexavalent chrome.
Background technology
Sexavalent chrome has strong toxicity, is easily accumulated by the Cell uptake of many tissues and organ in the human body, can disturb the activity of many important enzymes in the human body, and infringement liver and kidney are the carcinogens of generally acknowledging.Excessive (surpassing 10ppm) sexavalent chrome has lethal effect to aquatic organism.The industrial pollution source of chromium mainly from the waste water of the industries such as ore processing, Treatment of Metal Surface, leather tanning, printing and dyeing printing, has been classified as one of index of implementing overall control by environmental administration.This shows, must strictly monitor chromic content in surface water and the relevant enterprise discharge water, so that the water body that in time sexavalent chrome is exceeded standard is taked Counter-measures, avoid producing harm.
At present, the instrument of determination of hexavalent chromium mainly contains spectrophotometric method, chemoluminescence method, atomic spectroscopy, polarography, flow injection analysis, electrochemical process, neutron activation method, isotope dilution mass spectrometry etc.The sensitivity that these methods have is higher, and selectivity is good, but expensive instrument and reagent so that the scope of application be very restricted; The volume of the instrument that has is larger, and carrying is inconvenient, is not suitable for on-line real time monitoring.
Comparatively speaking, flow injection analysis has simply, changes fast and automatically the characteristics that degree is high and save indicator as a kind of new express-analysis technology, and development in recent years is very fast, is the method that present most automatic water quality monitoring system uses.But the ubiquity flow path designs is complicated, failure rate is high, bubble disturbs, measure the shortcomings such as precision is not high.
The utility model content
Fundamental purpose of the present utility model is to provide a kind of water quality sexavalent chrome full-automatic Fast measurement system, have that flow path designs is simple, the pure digi-tal Photoelectric Detection, get rid of bubble and disturb, the advantages such as full-automation, this system's testing result is accurate, reappearance is high, can be used for chromic full-automatic fast detecting in fresh water and the seawater.
In order to achieve the above object, the technical scheme that the utility model proposes is:
The full-automatic Fast measurement system of a kind of water quality sexavalent chrome, water sample is communicated with the interface of solenoid valve V1, one of two other interface of solenoid valve V1 is communicated with the interface of solenoid valve V2, two be communicated with the first interfaces of six-way valve by peristaltic pump, two other interface of solenoid valve V2 is communicated with respectively sexavalent chrome mark liquid B1 and sexavalent chrome mark liquid B2, the second interface of six-way valve is communicated with by quantitatively encircling with the 5th interface, the 3rd interface is communicated with current-carrying liquid by described peristaltic pump, the 4th interface by the threeway mixer respectively with an end of reaction tube, developer by described peristaltic pump is communicated with, the 6th interface is communicated with waste liquid W 1, the other end of reaction tube is communicated with the interface of solenoid valve V3, two other interface of solenoid valve V3 is communicated with respectively air and photoelectric detection system, and the other end of photoelectric detection system is communicated with waste liquid W 2;
The PLC Controlled by Programmable Controller is passed through in the conversion of connected relation between the interface of six-way valve:
When system was in sampling pattern, the first interface of six-way valve was communicated with the second interface, and the 3rd interface is communicated with the 4th interface, and the 5th interface is communicated with the 6th interface;
When system was in measurement pattern, the first interface of six-way valve was communicated with the 6th interface, and the 3rd interface is communicated with the second interface, and the 5th interface is communicated with the 4th interface.
Described connection all is communicated with by the PTFE tube road of polytetrafluoroethylmaterial material.
Described peristaltic pump is the flexible pipe that 4 passages were made and had to resistant material.
Described photoelectric detection system comprises single light source, flow cell and digital sensitization IC;
Described flow cell is for being used for the container of circulation mixed solution;
The illumination that described single light source sends is mapped on the mixed solution in the flow cell;
Described digital sensitization IC receives the light signal of mixed solution reflection, light signal is converted into digital signal, and passes through I
2C digital communication agreement is communicated by letter with the PLC Programmable Logic Controller.
Described PLC Programmable Logic Controller receives and stores the data that digital sensitization IC sends.
Described all reagent all utilize the storage of reagent bag.
Also comprise touch-screen, connect the PLC Programmable Logic Controller, the control operation button is provided and shows the control process.
Utility model has following beneficial effect and advantage:
1. the utility model is Flow Injection Technique and the coupling of single light source detection technique, and ingenious the solution is difficult to the air bubble problem that overcomes in the flow injection;
2. the digitizing sensitization IC that adopts first of the utility model has greatly reduced existing digital-to-analog conversion and photoelectricity and has amplified the noise that produces, and has improved accuracy of detection and the stability of instrument;
3. the utility model adopts and quantitatively encircles Ls to the water sample accurate quantification, the four-way peristaltic pump has guaranteed the constant of each flow rate of pipelines, therefore, the disperse state of sample in current-carrying liquid has the height reappearance in certain remaining time, thereby guaranteed the height reappearance of measurement result;
4. the utility model employing internal diameter is the PTFE tube road of 0.8mm, has greatly saved reagent dosage;
5. the utility model adopts Programmable Logic Controller PLC to realize full-automatic and the data processing, greatly reduces the failure rate of instrumentation control system;
6. it only is 2 minutes that the advantage that the utlity model has the stream of simplicity of design and flow injection unstable state reaction makes the time of finishing a water sample detection analysis, realizes real time on-line monitoring truly;
The utility model be used for to rivers and lakes, water factory the water bodys such as source water, industrial discharge water, seawater regularly or carry out at random chromic on-line monitoring, easy and obtain rapidly instant analysis data, can in time find water pollution accident, in time process, striven for the valuable time for removing a hidden danger.
Description of drawings
Fig. 1 is that the sampled-current pattern of native system is communicated with synoptic diagram;
Fig. 2 is that the measurement pattern of native system is communicated with synoptic diagram.
Wherein, C – current-carrying liquid, S – water sample, B1, B2 – sexavalent chrome standard solution, R – developer, V1, V2, V3 – solenoid valve, P – peristaltic pump, V4 – six-way valve, Ls – quantitatively encircles, X – threeway mixer, Lc – reaction tube, A – air, D – photoelectric detection system, W1, W2 – waste liquid.
Embodiment
The sampled-current pattern that is illustrated in figure 1 as native system is communicated with synoptic diagram, and the chromic all automatic measurement of basis system is comprised of peristaltic pump, six-way valve, solenoid valve, threeway mixer, photoelectric detection system, Programmable Logic Controller PLC, touch-screen, reagent bag, PTFE tube road etc.
In this system, the quantitative module of sample introduction by peristaltic pump P, six-way valve V4, quantitatively encircle Ls and form, its quantitatively length of ring be 45cm.Interface 4 links to each other with threeway mixer X, and interface 6 is waste liquid outlet, and interface 2 is connected with each other to form quantitative ring Ls with interface 5.Solenoid valve V1 is provided with interface 1 ~ 3, and solenoid valve V2 is provided with interface 4 ~ 6, and solenoid valve V3 is provided with interface 7 ~ 9; Wherein interface 3 is water sample S import, and interface 4 and interface 6 are respectively standard specimen B2, B 1 import, and interface 9 is air A import, interface 1 links to each other with interface 5, interface 2 links to each other with the interface 1 of six-way valve V4, and interface 7 links to each other with reaction tube Lc, and interface 8 links to each other with photoelectric detection system D.Six-way valve V4 is provided with 6 interfaces, wherein first interface links to each other with water sample source S by peristaltic pump P, and the 3rd interface links to each other with current-carrying liquid C by peristaltic pump P, and the 4th interface links to each other with threeway mixer X, the 6th interface is waste liquid outlet, and the second interface and the 5th interface are connected with each other to form quantitative ring Ls.
The first interface of six-way valve and the second interface communicate, and the 3rd interface and the 4th interface communicate, and the 5th interface and the 6th interface communicate, and sample is pumped to the quantitative ring Ls from first interface, and unnecessary sample is discharged from the 6th interface.
The measurement pattern that is illustrated in figure 2 as native system is communicated with synoptic diagram.
The first interface of six-way valve and the 6th interface are connected, the second interface and the 3rd interface are connected, the 4th interface and the 5th interface are connected, the sample that this moment, current-carrying liquid C promoted quantitatively to encircle among the Ls mixes with developer in the threeway mixer, mixed liquor enters reaction tube afterwards, finally carries out the detection of photovoltage in photoelectric detection system.
Native system adopts Flow Injection Technique, and by before flow cell, adding the mode of a solenoid valve, before each the measurement that the solution in the flow cell is emptying, solved the difficult problem that normal remaining micro-bubble is difficult to be discharged from the flow cell, namely solved the bubble difficult problem that Flow Injection Technique is difficult to overcome.
The photoelectric detection system critical piece is flow cell and the digital sensitization IC of 540nm single light source, 10mm light path.Utilize the single light source detection technique, avoided the interference at assorted peak; Adopt first digitized sensitization IC, directly light signal is converted into digital signal, realize Photoelectric Detection pure digi-tal truly, it passes through I
2C digital communication agreement directly realizes communicating by letter with CPU, has greatly reduced existing digital-to-analog conversion and photoelectricity and has amplified the noise that produces, and improves thereby accuracy of detection and stability have been had significantly.
Peristaltic pump is 4 passages, has guaranteed the consistance of each stream flow velocity, and pump line is selected the resistant material flexible pipe.
Programmable Logic Controller PLC is mainly and realizes full-automatic and the data processing, stable performance, failure rate is low.
Touch-screen can be controlled this system easily, and is convenient and simple quick.
The reagent storage mode adopts the reagent bag, replaces existing reagent bottle, can avoid extraneous bubble to enter pipeline fully, has guaranteed the reliability that Flow Injection Technique uses.
All pipelines are the polytetrafluoroethylmaterial material pipe of internal diameter 0.8mm.
The principles of chemistry can react at normal temperatures, need not heating.
System is by two state positions of six-way valve transformed samples and measurement, under the promotion of current-carrying liquid, the water sample of incision mixes with developer in the threeway mixer, the two spreads in current-carrying liquid and reacts, the aubergine compound that generates detects by photoelectric detection system, photooptical data is received and is processed by Programmable Logic Controller PLC, and content of 6-valence Cr ions is shown on the touch-screen automatically the most at last.
System both can detect chromic content in the fresh water, also can detect chromic content in the seawater by simple change agent prescription.
The automatic measuring process of sexavalent chrome measuring system:
1. the preparation of required reagent
(1) current-carrying liquid
Measure the 25ml concentrated sulphuric acid, slowly add in the 500ml deionized water, after the stirring cooling, add 25ml phosphoric acid, then adding distil water is settled to 1000ml.
(2) developer
Take by weighing 1g diphenyl phosphinylidyne two hydrazines (molecular formula is C13H14N4O), be dissolved in 180ml acetone, add water and be settled to 500ml, keep in Dark Place.
(3) sexavalent chrome standard stock solution
Accurately take by weighing 105 ℃ of lower potassium dichromate (K2Cr2O7) 0.2829 ± 0.0001g of dry 2 hours, after the water dissolving, move in the 1000ml volumetric flask, be diluted with water to graticule, shake up.This solution contains sexavalent chrome 100mg/L.
(4) sexavalent chrome titer B1(0 μ g/L): deionized water.
Sexavalent chrome titer B2(1000 μ g/L): get the sexavalent chrome standard stock solution 10ml of 100mg/L, join among the 1000ml, be diluted with water to graticule and shake up, store in (2～5 ℃ of lower preservations) in the Brown Glass Brown glass bottles and jars only.
If native system is measured sexavalent chrome in the seawater, then only need the NaCl solution constant volume of employing 3% when preparation current-carrying liquid and standard solution to get final product.
2. the concrete steps of system operation
But the native system fully automatic operation is controlled the data of action, reception and the storage flow cell of each parts by Programmable Logic Controller PLC.The selection of sample mode can be carried out by touch-screen, the operations such as instant sampling, periodic sampling, timing sampling can be selected.The below is the chromic concrete steps of the automatic sample detecting of single:
(1) sampling process
Interface selects 2 to communicate with 3 among the solenoid valve V1; Interface selects 8 to communicate with 9 among the solenoid valve V3, and the liquid in the flow cell is emptying under gravity and atmospheric pressure effect; Six-way valve V4 goes to left position state, and namely first interface communicates with the second interface, and the 3rd interface communicates with the 4th interface, and the 5th interface communicates with the 6th interface; Afterwards, interface selects 7 to communicate with 8 among the solenoid valve V3; Peristaltic pump P rotates, and actual water sample S is pumped among the quantitative ring Ls, and unnecessary water sample is discharged in the waste liquid W 1; Meanwhile, current-carrying liquid C is also mixing in threeway mixer X under the promotion of peristaltic pump P with developer R, and enters among the photoelectric detection system D via reaction tube Lc and solenoid valve V3, and after photovoltage was stable, the PLC record was also preserved base value I0; Peristaltic pump P stops operating.
(2) measuring process
Solenoid valve V1 and V3 state are constant; Six-way valve V4 goes to right position state, and namely first interface communicates with the 6th interface, and the second interface communicates with the 3rd interface, and the 4th interface communicates with the 5th interface; Peristaltic pump P rotates again, quantitatively the water sample among the ring Ls is cut in the current-carrying liquid, order with " current-carrying liquid ‖ water sample ‖ current-carrying liquid " distributes, developer R is promoted by peristaltic pump P always, and in the threeway mixer, meet with the current-carrying liquid phase that is loaded with quantitative water sample, enter among the photoelectric detection system D via reaction tube Lc and solenoid valve V3, the PLC record is also preserved peak I 1.
(3) cleaning process
The state of solenoid valve V1, V3 and six-way valve V4 is constant, and peristaltic pump P is rotated further, until the photovoltage value is got back to base value I0, shows that flushing of pipeline is clean, stops peristaltic pump P.
(4) computation process
PLC is according to above the data obtained I0 and I1, calculates the absorbance of water sample according to langbobier law, and the typical curve of demarcating gained with B1, B2 at 2 relatively calculates in the water sample chromic concentration and this value is shown on the touch-screen automatically.
Table 1 be with this measuring system detect three standard specimens and three water samples the detection data.
Table 1 water determination result and recovery of standard addition experiment (n=8)
More than test as can be known, the sample concentration that native system records and actual concentrations error are less, illustrate that native system has higher degree of accuracy.At aspect of performance, this system also has and measures fast and (30 samples/h), saves reagent, stability and high repeatability and other advantages; In actual applications, the native system stream is simple, and conserve space is easy to carry, and can carry out full-automatic real time on-line monitoring, has good application prospect.
Claims (7)
1. full-automatic Fast measurement system of water quality sexavalent chrome, it is characterized in that, water sample is communicated with the interface of solenoid valve V1, one of two other interface of solenoid valve V1 is communicated with the interface of solenoid valve V2, two be communicated with the first interfaces of six-way valve by peristaltic pump, two other interface of solenoid valve V2 is communicated with respectively sexavalent chrome mark liquid B1 and sexavalent chrome mark liquid B2, the second interface of six-way valve is communicated with by quantitatively encircling with the 5th interface, the 3rd interface is communicated with current-carrying liquid by described peristaltic pump, the 4th interface by the threeway mixer respectively with an end of reaction tube, developer by described peristaltic pump is communicated with, the 6th interface is communicated with waste liquid W 1, the other end of reaction tube is communicated with the interface of solenoid valve V3, two other interface of solenoid valve V3 is communicated with respectively air and photoelectric detection system, and the other end of photoelectric detection system is communicated with waste liquid W 2;
The PLC Controlled by Programmable Controller is passed through in the conversion of connected relation between the interface of six-way valve:
When system was in sampling pattern, the first interface of six-way valve was communicated with the second interface, and the 3rd interface is communicated with the 4th interface, and the 5th interface is communicated with the 6th interface;
When system was in measurement pattern, the first interface of six-way valve was communicated with the 6th interface, and the 3rd interface is communicated with the second interface, and the 5th interface is communicated with the 4th interface.
2. by the full-automatic Fast measurement system of water quality sexavalent chrome claimed in claim 1, it is characterized in that described connection all is communicated with by the PTFE tube road of polytetrafluoroethylmaterial material.
3. by the full-automatic Fast measurement system of water quality sexavalent chrome claimed in claim 1, it is characterized in that described peristaltic pump is the flexible pipe that 4 passages were made and had to resistant material.
4. by the full-automatic Fast measurement system of water quality sexavalent chrome claimed in claim 1, it is characterized in that described photoelectric detection system comprises single light source, flow cell and digital sensitization IC;
Described flow cell is for being used for the container of circulation mixed solution;
The illumination that described single light source sends is mapped on the mixed solution in the flow cell;
Described digital sensitization IC receives the light signal of mixed solution reflection, light signal is converted into digital signal, and passes through I
2C digital communication agreement is communicated by letter with the PLC Programmable Logic Controller.
5. by the full-automatic Fast measurement system of water quality sexavalent chrome claimed in claim 4, it is characterized in that described PLC Programmable Logic Controller receives and store the data that digital sensitization IC sends.
6. by the full-automatic Fast measurement system of water quality sexavalent chrome claimed in claim 1, it is characterized in that described all reagent all utilize the storage of reagent bag.
7. by the full-automatic Fast measurement system of water quality sexavalent chrome claimed in claim 1, it is characterized in that, also comprise touch-screen, connect the PLC Programmable Logic Controller, the control operation button is provided and shows the control process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220621188 CN202903673U (en) | 2012-11-21 | 2012-11-21 | Full-automatic quick water quality measuring system with hexavalent chromium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220621188 CN202903673U (en) | 2012-11-21 | 2012-11-21 | Full-automatic quick water quality measuring system with hexavalent chromium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202903673U true CN202903673U (en) | 2013-04-24 |
Family
ID=48124330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220621188 Withdrawn - After Issue CN202903673U (en) | 2012-11-21 | 2012-11-21 | Full-automatic quick water quality measuring system with hexavalent chromium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202903673U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980860A (en) * | 2012-11-21 | 2013-03-20 | 中国科学院烟台海岸带研究所 | Full-automatic quick measurement system and method for water quality hexavalent chromium |
| CN103645140A (en) * | 2013-12-30 | 2014-03-19 | 北京雪迪龙科技股份有限公司 | Water quality monitoring system and method |
| CN104655866A (en) * | 2013-11-21 | 2015-05-27 | 中国科学院烟台海岸带研究所 | Fully automatic copper, zinc, chromium and cadmium ion online enrichment and analysis system |
| CN104897669A (en) * | 2015-06-25 | 2015-09-09 | 无锡点创科技有限公司 | Three-way valve metering device of online water quality monitor |
| CN110632271A (en) * | 2019-10-17 | 2019-12-31 | 绍兴市三合检测技术有限公司 | Method for detecting heavy metal in soil |
-
2012
- 2012-11-21 CN CN 201220621188 patent/CN202903673U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980860A (en) * | 2012-11-21 | 2013-03-20 | 中国科学院烟台海岸带研究所 | Full-automatic quick measurement system and method for water quality hexavalent chromium |
| CN102980860B (en) * | 2012-11-21 | 2014-10-22 | 中国科学院烟台海岸带研究所 | Full-automatic quick measurement system and method for water quality hexavalent chromium |
| CN104655866A (en) * | 2013-11-21 | 2015-05-27 | 中国科学院烟台海岸带研究所 | Fully automatic copper, zinc, chromium and cadmium ion online enrichment and analysis system |
| CN103645140A (en) * | 2013-12-30 | 2014-03-19 | 北京雪迪龙科技股份有限公司 | Water quality monitoring system and method |
| CN104897669A (en) * | 2015-06-25 | 2015-09-09 | 无锡点创科技有限公司 | Three-way valve metering device of online water quality monitor |
| CN110632271A (en) * | 2019-10-17 | 2019-12-31 | 绍兴市三合检测技术有限公司 | Method for detecting heavy metal in soil |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102980860B (en) | Full-automatic quick measurement system and method for water quality hexavalent chromium | |
| CN101320001B (en) | High pressure flow injection rapid analysis system for permanganate index of water quality | |
| CN202903673U (en) | Full-automatic quick water quality measuring system with hexavalent chromium | |
| CN101603925A (en) | The hyperchannel direction selecting flow-injection quick analysis system for hexavalent chromium water quality | |
| CN101793902A (en) | Device for fluidly injecting and rapidly analyzing residual chlorine of water quality and analysis method thereof | |
| CN102262078B (en) | Method of atomic fluorescence spectrometry shape analysis by on-line pre-reducing trivalent arsonium and quinquivalent arsonium, and its apparatus | |
| CN108318618A (en) | One kind being suitable for the high chlorine root sanitary sewage COD rapid detection methods of production platform | |
| de Faria et al. | Flow-injection determination of inorganic forms of nitrogen by gas diffusion and conductimetry | |
| CN102650590A (en) | Method for determining content of nitrogen in nitrate and/or nitrite of water sample and device thereof | |
| CN101603969A (en) | Flow-injection quick analysis system for hexavalent chromium water quality | |
| CN104483280A (en) | Method for rapidly detecting ammonia nitrogen removal rate | |
| CN102980858B (en) | Small-size sequential injection nitride analysis system | |
| CN101187637B (en) | Automatic analysis method for seawater phenols compounds | |
| CN201765189U (en) | Water hexavalent chromium flow-injection on-line analyzer | |
| CN101101264B (en) | Automatic analysis method for seawater sulfide | |
| CN110308140A (en) | A method of utilizing the detection chemical substance of potassium ferrate | |
| Liang et al. | Flow injection analysis of nanomolar level orthophosphate in seawater with solid phase enrichment and colorimetric detection | |
| CN101696938B (en) | Method for online monitoring of copper ions in water through flow injection | |
| CN102590535A (en) | Automatic analysis method of nitrite in water sample | |
| CN110907586A (en) | Method for measuring content of sulfite in water | |
| CN103308703B (en) | Automatic analysis method of formaldehyde in water sample | |
| CN201765236U (en) | Full-automatic nutritive salt analyzer | |
| CN210322809U (en) | Device for analyzing and determining cyanide in water by flow injection | |
| CN210269598U (en) | Chemical analysis system for total nitrogen | |
| Yaping et al. | Spectrophotometric determination of urinary iodine by flow-injection analysis with on-line catalytic digestion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130424 Effective date of abandoning: 20141022 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20130424 Effective date of abandoning: 20141022 |
|
| RGAV | Abandon patent right to avoid regrant |