CN203535000U - Portable detector for detection of heavy metal in water environment - Google Patents
Portable detector for detection of heavy metal in water environment Download PDFInfo
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- CN203535000U CN203535000U CN201320676285.1U CN201320676285U CN203535000U CN 203535000 U CN203535000 U CN 203535000U CN 201320676285 U CN201320676285 U CN 201320676285U CN 203535000 U CN203535000 U CN 203535000U
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- water environment
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- metal detector
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Abstract
The utility model relates to a portable detector for detection of heavy metal in water environment, in particular to a portable detector for detection of heavy metal in water environment, which adopts three-pole detection and can detect the concentration of various metals. The portable detector comprises a microprocessor module, and a power supply module, a keystroke handling module, a potentiostat module, a stirrer, a driving module, a display module and an interface module, which are connected to the microprocessor module. The potentiostat module comprises a three-electrode electro-chemical sensor comprising a working electrode, an auxiliary electrode and a reference electrode; the reference electrode is connected to the input end of an open-loop amplifier via a first tracker, and the output end of the open-loop amplifier is connected to the auxiliary electrode; and, the working electrode is connected to the input end of a second tracker via a reverse proportional amplifier, and the output end of the second tracker is connected to the input end of the microprocessor module via an A/D conversion module. The portable detector has a function of monitoring the concentration of various metals. The portable detector is simple to operate, convenient to carry and easy to use.
Description
Technical field
The utility model relates to a kind of Portable water environment heavy metal detector, and especially a kind of Portable water environment heavy metal detector that can detect many metal concentrations, adopt three utmost points to detect, belongs to environment-protective water environment measuring field.
Background technology
Heavy metal refers to that atomic density is greater than the metallic element of 5g/cm3, and nearly kind more than 40, as copper, lead, zinc, cadmium, manganese, iron, cobalt, nickel, vanadium, mercury, tungsten etc.Heavy metal pollution is one of maximum water pollution problems of harm.Along with expediting the progress of Chinese Urbanization's, and large-scale industrial development, heavy metal passes through mining, metal smelt, metal processing and chemical production wastewater, the burning of fossil fuel, the man-made pollution sources such as applying pesticides chemical fertilizer and house refuse, and geologic erosion, the native forms such as weathering enter water body, in addition heavy metal, mercury particularly, plumbous, cadmium, chromium etc., and can not be degraded by microorganisms in water body, and can only there is mutual conversion and the dispersion of various forms, enrichment process (i.e. migration), polluted water resources not only, also the existence of the serious threat mankind and aquatic organism.
Water environment mainly comprises the water body environments such as river, lake, reservoir, ocean and process water, discharge water and Drinking Water.In recent years, various Heavy Metal Pollution in Water Environment of China problems aggravate to have become undisputable fact increasingly.The pollution rate of river,lake and reservior substrate is up to 80.1%, Taihu Lake is China's the third biggest fresh water lake, the sampling analysis result of 2005 shows, compare with maritime state's sediment standard (GB18668-2002), soil environment quality national standard (GB15618-1995) and ecological hazard critical value (TEL), in the sediments of Taihu Lake, occurred the combined pollution of heavy metal, pollutant is mainly Cu, Cd, Ni, Zn.
At present, the method for monitoring heavy metal mainly comprises atomic spectroscopy, mass spectrometry, By Naa, ultraviolet-visible spectrophotometry, chemoluminescence method and electrochemical methods.Several analytical approachs such as spectrum, mass spectrum, neutron activation, spectrophotometric some exist instrument expensive, and operating cost is higher the shortcoming such as maybe should not carry, and at aspects such as monitoring and on-the-spot the real time measure continuously, is very restricted; Some complex pretreatment, needs extraction, enrichment method or suppresses to disturb; Some can not carry out polycomponent or multielement analysis; Some instrumental sensitivity or monitoring limit do not reach set quota requirement.
Utility model content
The purpose of this utility model is: the problem existing for above-mentioned prior art, propose a kind of can high sensitivity, high-level efficiency monitoring various metals concentration, information storage is large, can carry out to each metal concentration data in the water quality of monitoring the Portable water environment heavy metal detector of system finishing.
In order to reach above object, a kind of Portable water environment heavy metal detector of the present utility model, comprise microprocessor module and the power module being connected with microprocessor module, keystroke handling module, potentiostat module, stirrer and driver module, display module and interface module, potentiostat module comprises three electric pole type electrochemical sensors, three electric pole type electrochemical sensors comprise working electrode, auxiliary electrode and contrast electrode, contrast electrode connects the input end of amplifier by the first tracker, the output terminal of amplifier connects auxiliary electrode, working electrode connects the input end of the second tracker by reverse proportional amplifier, the output terminal of the second tracker is connected with microprocessor module input end by analog-to-digital conversion module.
Preferred version of the present utility model is: the output terminal of microprocessor module connects the input end of the first amplifier by digital-to-analogue conversion module.
Preferably, microprocessor module contains microprocessor and data storage cell, and data storage cell connects microprocessor.
Preferably, power module comprises power supply processing unit and chargeable back-up cell, and chargeable back-up cell is connected with power supply processing unit.Preferably, stirrer and driver module adopt micro-shape direct current generator to drive stirring machine.
Preferably, display module is connected with microprocessor module by interface module.
Preferably, interface module contains blue tooth interface, and blue tooth interface connects external unit.
Preferably, working electrode adopts gold or glass carbon, and auxiliary electrode adopts platinum, and contrast electrode adopts silver or silver chloride.
The utility model beneficial effect is:
1, adopt three electrodes to monitor, improved efficiency and the sensitivity of monitoring, this equipment can be monitored the concentration of ten triple-heavy metals in water quality simultaneously.
2, equipment has designed bluetooth module interface, and supporting mini-printer, facilitates field to print in time heavy metal monitoring result.
3, the utility model comprises hardware check brake, when system initialization, and by certainly detecting, if find hardware problem, and alarm, or turn-off apparatus, in order to avoid cause larger loss.
Auto-breaking during 4, reserve battery electric weight deficiency warning, and reserve battery feed, prevents that reserve battery feed from being used, in order to avoid shorten the reserve battery life-span.
5, reserved open platform interface, each parameter can independently be set, and is convenient to the monitoring that user independently sets other heavy metal.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is further described.
Fig. 1 is the utility model system architecture diagram.
Fig. 2 is the utility model anodic stripping voltammetry oscillogram.
Fig. 3 is the utility model software flow figure.
Embodiment
Embodiment mono-
A kind of Portable water environment heavy metal detector of the present embodiment, its structure as shown in Figure 1, comprise microprocessor module and the power module being connected with microprocessor module, keystroke handling module, potentiostat module, stirrer and driver module, display module and interface module, potentiostat module comprises three electric pole type electrochemical sensors, three electric pole type electrochemical sensors comprise working electrode WE, auxiliary electrode CE and contrast electrode RE, contrast electrode RE connects the input end of amplifier U2 by the first tracker U3, the output terminal of amplifier U2 connects auxiliary electrode CE, working electrode WE connects the input end of the second tracker U5 by reverse proportional amplifier U4, the output terminal of the second tracker U5 is connected with microprocessor module input end by analog-to-digital conversion module.
In the present embodiment, the power module of equipment provides direct current 12V voltage for system, and power supply processing unit becomes the needed voltage of inner each module by direct current 12V voltage transitions, is respectively 3.3V, ± 5V.Meanwhile, inside comprises chargeable back-up cell.When outside direct current 12V power-off, system can automatically switch to internal backup battery power supply, is convenient to field and works without alternating current 220V power supply place.When having external power source, the voltage of timing monitoring charge inside battery, when voltage is during lower than a certain threshold value, system starts reserve battery to power automatically.
Microprocessor module, comprises MCU and EEPROM, and MCU is the heart of portable processor, and system adopts the MCU of 16 of the RL78/G13 series of Renesas, and its dominant frequency is up to 32MHZ.EEPROM is used for storage of measurement data, and system version information etc.System can be preserved the historical data of nearly 1000 left and right, and the data of being convenient to operate are in the wild preserved.
Keystroke handling module, refers to system operation part, and user operates system by button, realizes the various functions of system.The button that system comprises has, power button, left/right button, acknowledgement key, cleaning button and stirring button etc.
Potentiostat module, potentiostat is the core in system, be the interface of various three electric pole types (working electrode, auxiliary electrode, contrast electrode) electrochemical sensor, mainly external drive signal be close to and put on exactly on sensor, drive sample solution generation electrochemical reaction.Early stage amperometric sensor only has two electrodes (working electrode and contrast electrode), during work, voltage is added between two electrodes.Within the scope of this voltage permissible error, sensor is output as linearity, but along with the increase of gas concentration, the Faradaic current of flowing through between two electrodes can make its voltage allowed band of working electrode voltage deviation, makes sensor output unstable.So, on the basis of two electrodes, increase contrast electrode.By control, make the current potential between working electrode and contrast electrode keep certain, make the current potential of working electrode and auxiliary electrode keep certain, form potentiostat circuit.Three electrodes in system in U2, U3, U4 and stirring pool, have formed the potentiostat of system together.Wherein, U3 makees the first follower, and the voltage of RE is done and fed back; U2 makees open loop amplifier in system, and the control voltage respectively RE voltage and sixteen bit DA being converted compares, then open loop amplifies, and output voltage is to auxiliary electrode; The effect of U4 is under the condition of externally-applied potential, makes solution generation electrochemical reaction to be measured, thereby measures the electric current producing on this electrode; Auxiliary electrode and working electrode form a conducting loop; And reference is as the reference electrode of working electrode and auxiliary electrode.The electric current of flowing through on working electrode becomes voltage by U4 by current conversion, according to the difference of gear, switches Rx(x=1,2,3,4,5) and Sx(x=1,2,3,4,5) make electric current become voltage through different enlargement factors, the effect of U4 in system is reverse proportional amplifier, and U5 is the second follower, increases the internal resistance of voltage.Sixteen bit AD converter receives the voltage signal of coming from U5, to MCU.MCU, according to magnitude of voltage and corresponding Rx value, according to Ou Mo law, calculates the current value of the working electrode of flowing through.
Stirrer and driver module thereof: in the liquid to be measured of system, when enrichment, with stirrer, solution is stirred, accelerate the decomposition of heavy metal in solution.Stirrer adopts DC micromotor, and system comprises motor drive module.When needs stir, system drive machine operation, motor speed reaches 5000 rpms of left and right.
Display module, the TFT display screen that display section comprises indicative control unit and 3.2 inches.MCU is by UART interface and indicative control unit communication, and indicative control unit is controlled and drive TFT display screen.Instrumentation personnel, by button operation system, by TFT display screen, obtain system real-time information.System is by TFT display screen, obtains true-time operation prompting, final solution concentration shows, and heavy metal detection peak squiggle etc. in solution, simple and clear.
Interface module, mainly comprises USB interface and blue tooth interface.USB interface is mainly used in Portable heavy metal detector and is connected with host computer.Instrumentation personnel, by the software of operation host computer on computers, can operate and control portable set more easily.Bluetooth module, is mainly used in the mini-printer of connecting band blue tooth interface, is convenient for carrying operation in the wild.Can, in real time by test data, by mini-printer, print.
System Working Principle of the present utility model is as follows:
The operation of anodic stripping voltammetry mainly divides three steps: enrichment, static and scanning (stripping).As shown in Figure 2, first, measured matter in solution is enriched on working electrode by electrolysis under certain potentials, then, for a moment static, make by the material of enrichment branch on working electrode even, to improve the repeatability of analysis result, then reverse scan current potential, makes measured matter Fast Stripping and obtains larger Stripping Currents peak.Stripping Currents peak height solubility in measured matter within the scope of certain solubility is directly proportional, and occurs that the current potential at Stripping Currents peak is relevant with the character of measured matter.
Three steps based on Anodic stripping voltammetry method, design system software, the workflow of system software is as shown in Figure 3.
Main thought is: first configure blank sample, adopt anodic stripping voltammetry, measure and to go out peak voltage under scanning voltage, secondly, same method, configuration standard sample, know in the situation of solubility of standard sample, measure its crest voltage, then configure a liquid to be measured, scanning voltage while going out peak voltage according to standard sample, system is found out liquid to be measured and go out peak voltage under this scanning voltage.Can infer the solubility that liquid to be measured.
The advantage of this equipment is:
1, adopt three electrodes to monitor, improved efficiency and the sensitivity of monitoring, this equipment can be monitored the concentration of ten triple-heavy metals in water quality simultaneously.
2, equipment has designed bluetooth module interface, and supporting mini-printer, facilitates field to print in time heavy metal monitoring result.
3, the utility model comprises hardware check brake, when system initialization, and by certainly detecting, if find hardware problem, and alarm, or turn-off apparatus, in order to avoid cause larger loss.
Auto-breaking during 4, reserve battery electric weight deficiency warning, and reserve battery feed, prevents that reserve battery feed from being used, in order to avoid shorten the reserve battery life-span.
5, reserved open platform interface, each parameter can independently be set, and is convenient to the monitoring that user independently sets other heavy metal.
In addition to the implementation, the utility model can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.
Claims (8)
1. a Portable water environment heavy metal detector, comprise microprocessor module and the power module being connected with microprocessor module, keystroke handling module, potentiostat module, stirrer and driver module, display module and interface module, it is characterized in that: described potentiostat module comprises three electric pole type electrochemical sensors, described three electric pole type electrochemical sensors comprise working electrode (WE), auxiliary electrode (CE) and contrast electrode (RE), described contrast electrode (RE) connects the input end of open loop amplifier (U2) by the first tracker (U3), the output terminal of described open loop amplifier (U2) connects described auxiliary electrode (CE), described working electrode (WE) connects the input end of the second tracker (U5) by reverse proportional amplifier (U4), the output terminal of described the second tracker (U5) is connected with microprocessor module input end by analog-to-digital conversion module.
2. Portable water environment heavy metal detector according to claim 1, is characterized in that: the output terminal of described microprocessor module connects the input end of described the first amplifier by digital-to-analogue conversion module.
3. Portable water environment heavy metal detector according to claim 1, is characterized in that: described microprocessor module contains microprocessor and data storage cell, and described data storage cell connects described microprocessor.
4. Portable water environment heavy metal detector according to claim 1, is characterized in that: described power module comprises power supply processing unit and chargeable back-up cell, and described power supply processing unit connects described reserve battery.
5. Portable water environment heavy metal detector according to claim 1, is characterized in that: described stirrer and driver module adopt micro-shape direct current generator to drive stirring machine.
6. Portable water environment heavy metal detector according to claim 1, is characterized in that: described display module is connected with described microprocessor module by described interface module.
7. Portable water environment heavy metal detector according to claim 6, is characterized in that: described interface module contains blue tooth interface, and described blue tooth interface connects external unit.
8. Portable water environment heavy metal detector according to claim 1, is characterized in that: described working electrode adopts gold or glass carbon, and described auxiliary electrode adopts platinum, and described contrast electrode adopts silver/silver chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320676285.1U CN203535000U (en) | 2013-10-30 | 2013-10-30 | Portable detector for detection of heavy metal in water environment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320676285.1U CN203535000U (en) | 2013-10-30 | 2013-10-30 | Portable detector for detection of heavy metal in water environment |
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| CN203535000U true CN203535000U (en) | 2014-04-09 |
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| CN201320676285.1U Expired - Fee Related CN203535000U (en) | 2013-10-30 | 2013-10-30 | Portable detector for detection of heavy metal in water environment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280426A (en) * | 2014-10-22 | 2015-01-14 | 中山欧麦克仪器设备有限公司 | Portable dissolved oxygen detection device |
| CN104297324A (en) * | 2014-10-31 | 2015-01-21 | 中国科学院上海微系统与信息技术研究所 | Portable heavy metal ion detecting instrument and method based on Android |
| CN104614568A (en) * | 2014-12-04 | 2015-05-13 | 深圳市德赛微电子技术有限公司 | Current-voltage converter with drive function |
| CN106198625A (en) * | 2016-06-02 | 2016-12-07 | 东北电力大学 | One heavy metal species on-line monitoring system device in situ |
| CN110501391A (en) * | 2019-08-27 | 2019-11-26 | 西安理工大学 | A kind of Portable heavy metal detector and its method of automatically replaceable electrode |
| CN111579628A (en) * | 2020-06-24 | 2020-08-25 | 南方科技大学 | Arsenic analyzer, system device comprising same and application of device |
-
2013
- 2013-10-30 CN CN201320676285.1U patent/CN203535000U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280426A (en) * | 2014-10-22 | 2015-01-14 | 中山欧麦克仪器设备有限公司 | Portable dissolved oxygen detection device |
| CN104297324A (en) * | 2014-10-31 | 2015-01-21 | 中国科学院上海微系统与信息技术研究所 | Portable heavy metal ion detecting instrument and method based on Android |
| CN104614568A (en) * | 2014-12-04 | 2015-05-13 | 深圳市德赛微电子技术有限公司 | Current-voltage converter with drive function |
| CN106198625A (en) * | 2016-06-02 | 2016-12-07 | 东北电力大学 | One heavy metal species on-line monitoring system device in situ |
| CN110501391A (en) * | 2019-08-27 | 2019-11-26 | 西安理工大学 | A kind of Portable heavy metal detector and its method of automatically replaceable electrode |
| CN111579628A (en) * | 2020-06-24 | 2020-08-25 | 南方科技大学 | Arsenic analyzer, system device comprising same and application of device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20141030 |
|
| EXPY | Termination of patent right or utility model |