WO2005064328A1 - Verfahren zur fotometrischen bestimmung eines parameters - Google Patents
Verfahren zur fotometrischen bestimmung eines parameters Download PDFInfo
- Publication number
- WO2005064328A1 WO2005064328A1 PCT/EP2004/013279 EP2004013279W WO2005064328A1 WO 2005064328 A1 WO2005064328 A1 WO 2005064328A1 EP 2004013279 W EP2004013279 W EP 2004013279W WO 2005064328 A1 WO2005064328 A1 WO 2005064328A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- liquid sample
- extinction
- determination
- reaction mixture
- parameter
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008033 biological extinction Effects 0.000 claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 239000011541 reaction mixture Substances 0.000 claims abstract description 19
- 230000001590 oxidative effect Effects 0.000 claims abstract description 13
- 238000009835 boiling Methods 0.000 claims abstract description 6
- 238000002835 absorbance Methods 0.000 claims description 17
- 230000029087 digestion Effects 0.000 claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000007884 disintegrant Substances 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims description 4
- 230000002123 temporal effect Effects 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 abstract 4
- 239000012482 calibration solution Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 3
- 230000000873 masking effect Effects 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000007620 mathematical function Methods 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- YPNVIBVEFVRZPJ-UHFFFAOYSA-L silver sulfate Chemical compound [Ag+].[Ag+].[O-]S([O-])(=O)=O YPNVIBVEFVRZPJ-UHFFFAOYSA-L 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1806—Biological oxygen demand [BOD] or chemical oxygen demand [COD]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/251—Colorimeters; Construction thereof
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
- G01N21/272—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration for following a reaction, e.g. for determining photometrically a reaction rate (photometric cinetic analysis)
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
Definitions
- the invention relates to a method for the photometric determination of a parameter of a liquid sample subjected to an oxidative digestion.
- CMOS complementary metal-oxide-semiconductor
- COD chemical oxygen demand
- a cuvette is first filled with the liquid sample and a disintegrant, which changes the absorbance of the reaction mixture formed in this way.
- the reaction mixture is brought to a boil under atmospheric pressure.
- the reaction mixture undergoes a color change, the intensity of which depends on the concentration of the quantitatively determined substances in the liquid sample. Since the different substances to be determined within a liquid sample can have digestion times of very different lengths, the intensity of the color change is only determined photometrically after a relatively long fixed period of time and the parameter in question is calculated from this.
- the standardized digestion time is two hours.
- the object of the invention is to provide a faster method for the photometric determination of a parameter of a liquid sample subjected to an oxidative digestion.
- the liquid sample-disintegrant reaction mixture in the cuvette is heated to a temperature above its atmospheric boiling temperature during the entire disintegration time, with the pressure being closed.
- the absorbance of the reaction mixture is determined quasi-continuously at at least one defined wavelength in the cuvette throughout the digestion.
- the extinction determination is finally ended when a defined state with regard to the extinction is reached.
- the duration of a parameter determination is therefore accelerated by two measures, namely by heating the reaction mixture to a temperature above the atmospheric boiling temperature and by a dynamic measurement period.
- a prerequisite for the dynamic measurement duration is the continuous determination of the absorbance of the reaction mixture already during the digestion in the cuvette.
- the absorbance determination is ended as soon as the time course of the measured absorbance reaches a defined state.
- the specified state is selected so that the parameter to be determined can be determined with great certainty and with sufficient accuracy. For example, the oxidative digestion of the liquid sample can be almost completely completed after a few minutes, so that the absorbance determination can also be ended after a few minutes and a new liquid sample can be subjected to the determination. A long-lasting extinction determination only takes place with liquid samples, which also require this due to their slow oxidative digestion.
- the defined state in which the absorbance determination is ended is a value of minimal change in the absorbance over time. As soon as the extinction changes only slightly over time, the extinction determination is ended and the parameter in question is determined or extrapolated from the last measured extinction value. In this way, a simple criterion for ending the absorbance determination is created, which allows reliable operation and a relatively precise determination of the parameter in question.
- the defined state is preferably a limit value x for the ratio of the extinction last determined to an end extinction extrapolated from the time course of the specific extinctions.
- An end absorbance is determined from the temporal course of the already determined extinctions using a mathematical function, for example an e-function.
- the extinction determination is ended as soon as the ratio of the extinction last determined to the extrapolated final extinction has reached a limit value x which is, for example, greater than or equal to 0.95 or 0.99. Because with this In this method, the temporal course of the already determined extinctions is always included, this method for determining the defined state in which the extinction determination is ended offers a high degree of security against the extinction determination being ended too early and an incorrect determination of the relevant parameter.
- the liquid sample is a sample from waste water.
- the method is suitable for the continuous monitoring of wastewater.
- the reaction mixture is preferably heated to a fixed temperature value of over 155 ° C.
- the set temperature is about 175 ° C. At these temperatures above the atmospheric boiling point in the COD determination, the oxidative digestion is accelerated considerably.
- the parameter to be determined is preferably the chemical oxygen requirement of the liquid sample.
- the parameter to be determined can also be the total nitrogen of the liquid sample.
- the figure shows a device for carrying out the method according to the invention for the photometric determination of a parameter of a liquid sample subjected to an oxidative digestion.
- a determination device 10 for determining the chemical oxygen demand (COD) is shown.
- the CSB chemical oxygen demand
- Determination device 10 works automatically and quasi-continuously. It essentially consists of several containers 21-27 with one Liquid sample, calibration solutions, color change solubilizers,
- the containers 21-27, the lower end of the metering chamber 12 and the lower end of the cuvette 16 are interconnected in a star-like manner by short lines of small diameter.
- the entire COD determination device 10 is controlled by a control device 62.
- the piston pump 14 is driven by a motor 15.
- a three-way valve 30 is arranged between the piston pump 14 and the metering chamber 12, which selectively connects the piston pump 14, the metering chamber 12 and the atmosphere to one another.
- the dosing chamber 12 has two light barriers 32, 34, which serve to determine the fill level of a liquid in the dosing chamber 12.
- the light barriers 32, 34 detect the liquid level in the dosing chamber at 200 ⁇ l or 750 ⁇ l.
- the cuvette 16 has a one-piece transparent glass body 17 which can be heated by a heating device 38. Furthermore, the cuvette 16 has a photometer 40, which is designed as an LED photometer and determines the extinction at a wavelength of 600 nm.
- a ventilation valve 42 is provided at the upper end of the cuvette glass body 17 and an inlet / outlet valve 44 is provided at the lower end.
- the contents of the containers 21-27 are as follows: In a container 21 there is a liquid sample 60.
- the liquid sample 60 is a sample from waste water.
- two containers 22, 23 there is a calibration solution, namely in one container 22 a standard calibration solution and in the other container 23 distilled water as a zero calibration solution.
- Another container 24 contains mercury (I ⁇ ) sulfate (HgSO 4 ) for masking chloride ions in the liquid sample.
- Another container 25 contains silver sulfate (Ag 2 SO 4 ) as a catalyst.
- Another container 26 contains potassium dichromate (K 2 Cr 2 O 7 ) as a disintegrant.
- a last container 27 holds the waste liquids.
- a valve 51-57 is assigned to each of the containers 21-27. All valves 30, 42, 44, 51-57 are electromagnetic valves that have a closed position and an open position.
- the procedure for the photometric determination of the parameter COD of the liquid sample 16 subjected to an oxidative digestion is as follows: First, a liquid sample 60 is drawn from the relevant container 21 through the piston pump 14 into the metering chamber 12, from where it is then pumped into the cuvette 16 to become.
- one of the two calibration solutions can also be pumped from the containers 22, 23 into the cuvette 16.
- the masking agent two parts of the catalyst and part of the color change disintegrant are pumped from the containers 24, 25, 26 into the cuvette 16. Then both valves 42, 44 assigned to the cuvette 16 are closed and the heating device 38 is put into operation.
- the heating device 38 heats the reaction mixture in the cuvette 16 to a temperature of approximately 175 ° C. at a pressure of 5 to 10 bar and keeps this temperature constant.
- the photometer 40 begins the extinction of the reaction mixture in the quasi-continuously with approximately 3 measurements per second To determine cuvette vitreous 17. The determined extinction values are evaluated and stored in the control device 62.
- the set state is a value of minimal change in absorbance over time, for example a change in absorbance of less than one percent in 10 seconds.
- the defined state can also be a limit value x for the ratio of the extinction determined last to the final extinction extrapolated from the time course of the already determined extinctions. This final extinction is determined by the control device 62 with the aid of suitable mathematical functions. With a ratio x of 0.95 of the last extinction value determined to the extrapolated final extinction value, the defined state is reached and the extinction determination is ended.
- the limit value x can also be 0.99.
- COD chemical oxygen demand
- the above-described method can in principle also be used to determine the total nitrogen of a liquid sample.
- appropriate suitable reagents are used instead of the reagents described in the containers 22-26.
- the oxidative digestion is accelerated considerably.
- the mean measurement time is significantly reduced. This means that several measurements per hour can be carried out if necessary and the quality of the liquid sample can be monitored more closely.
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Plasma & Fusion (AREA)
- Biodiversity & Conservation Biology (AREA)
- Biomedical Technology (AREA)
- Emergency Medicine (AREA)
- Molecular Biology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10360066.3 | 2003-12-20 | ||
DE2003160066 DE10360066A1 (de) | 2003-12-20 | 2003-12-20 | Verfahren zur fotometrischen Bestimmung eines Parameters |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005064328A1 true WO2005064328A1 (de) | 2005-07-14 |
Family
ID=34683642
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/013279 WO2005064328A1 (de) | 2003-12-20 | 2004-11-23 | Verfahren zur fotometrischen bestimmung eines parameters |
Country Status (4)
Country | Link |
---|---|
CN (1) | CN1629623A (de) |
DE (1) | DE10360066A1 (de) |
TW (1) | TW200526956A (de) |
WO (1) | WO2005064328A1 (de) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102279123A (zh) * | 2011-06-14 | 2011-12-14 | 聚光科技(杭州)股份有限公司 | 一种前处理方法和装置 |
DE102011075762A1 (de) | 2011-05-12 | 2012-11-15 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Analysegerät zur automatisierten Bestimmung einer Messgröße einer Messflüssigkeit |
CN104458733A (zh) * | 2014-12-17 | 2015-03-25 | 河北先河环保科技股份有限公司 | 一种比色法氨氮自动监测仪消解比色装置 |
DE102013114138A1 (de) | 2013-12-16 | 2015-06-18 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Aufschlussreaktor und Analysegerät zur Bestimmung eines Aufschlussparameters einer Flüssigkeitsprobe |
CN106053202A (zh) * | 2016-06-12 | 2016-10-26 | 山东思睿环境设备科技有限公司 | 高温高压消解比色装置 |
CN106124287A (zh) * | 2016-06-13 | 2016-11-16 | 山东思睿环境设备科技有限公司 | 高温高压消解光纤比色系统 |
US20170089750A1 (en) * | 2015-09-28 | 2017-03-30 | Endress+Hauser Conducta Gmbh+Co. Kg | Device for dispensing a liquid |
CN107831121A (zh) * | 2017-11-22 | 2018-03-23 | 江苏蓝创智能科技股份有限公司 | 多参数水质检测仪及其使用方法 |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5367710B2 (ja) * | 2007-09-05 | 2013-12-11 | ジーイー・アナリティカル・インストルメンツ・インコーポレイテッド | 高温および高圧下で酸化を利用する水性サンプル中の炭素測定 |
DE102009028165B4 (de) | 2009-07-31 | 2017-03-30 | Endress+Hauser Conducta Gmbh+Co. Kg | Verfahren und Vorrichtung zur automatisierten Bestimmung des chemischen Sauerstoffbedarfs einer Flüssigkeitsprobe |
DE102013108556A1 (de) | 2013-08-08 | 2015-02-12 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Verfahren und Analysegerät zur Bestimmung des chemischen Sauerstoffbedarfs einer Flüssigkeitsprobe |
DE102013109168A1 (de) | 2013-08-23 | 2015-02-26 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Analysegerät zur Bestimmung des chemischen Sauerstoffbedarfs einer Flüssigkeitsprobe |
DE102013114132A1 (de) * | 2013-12-16 | 2015-06-18 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Aufschlussreaktor und Analysegerät zur Bestimmung eines Aufschlussparameters einer Flüssigkeitsprobe |
DE102014119547A1 (de) | 2014-08-13 | 2016-02-18 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Vorrichtung und Verfahren zum Entfernen von Chlorid aus einer Flüssigkeitsprobe |
CN106556533A (zh) * | 2015-09-25 | 2017-04-05 | 株式会社岛津制作所 | 一种排除气体和液体的方法 |
DE102015117637A1 (de) * | 2015-10-16 | 2017-04-20 | Endress+Hauser Conducta Gmbh+Co. Kg | Verfahren zur Verbesserung einer Messgenauigkeit eines nasschemischen Analysegerätes bei einer Bestimmung eines Parameters einer zu analysierenden Flüssigkeit |
DE102015117639A1 (de) * | 2015-10-16 | 2017-04-20 | Endress+Hauser Conducta Gmbh+Co. Kg | Verfahren zur Sicherstellung der Betriebsfähigkeit eines Analysegerätes vor einer Bestimmung eines Aufschlussparameters einer Flüssigkeitsprobe |
DE102019122163A1 (de) * | 2019-08-19 | 2021-02-25 | Endress+Hauser Conducta Gmbh+Co. Kg | Messanordnung zur Messung des gesamten gebundenen Stickstoffs in einer Messflüssigkeit |
Citations (2)
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DE4222982A1 (de) * | 1992-07-13 | 1994-01-20 | Lange Gmbh Dr Bruno | Verfahren zur Schnellbestimmung des Gesamtstickstoffgehalts |
DE10024903A1 (de) * | 2000-05-19 | 2001-11-22 | Wtw Weilheim | Gerät und Verfahren zur Bestimmung des gelösten anorganischen Stickstoffs in Flüssigkeiten |
Family Cites Families (2)
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DE4109118C2 (de) * | 1991-03-20 | 1995-04-06 | Lange Gmbh Dr Bruno | Verfahren zum automatischen Auswerten eines Probeninhaltsstoffes einer Wasserprobe |
AT407802B (de) * | 1998-02-26 | 2001-06-25 | Staudinger Gernot | Vorrichtung zur messung der zeitlichen entwicklung der transparenz eines in einer küvette sedimentierenden klärschlammes |
-
2003
- 2003-12-20 DE DE2003160066 patent/DE10360066A1/de not_active Ceased
-
2004
- 2004-05-20 CN CN 200410045881 patent/CN1629623A/zh active Pending
- 2004-11-23 WO PCT/EP2004/013279 patent/WO2005064328A1/de active Application Filing
- 2004-12-17 TW TW93139246A patent/TW200526956A/zh unknown
Patent Citations (2)
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DE4222982A1 (de) * | 1992-07-13 | 1994-01-20 | Lange Gmbh Dr Bruno | Verfahren zur Schnellbestimmung des Gesamtstickstoffgehalts |
DE10024903A1 (de) * | 2000-05-19 | 2001-11-22 | Wtw Weilheim | Gerät und Verfahren zur Bestimmung des gelösten anorganischen Stickstoffs in Flüssigkeiten |
Non-Patent Citations (1)
Title |
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DASGUPTA P K ET AL: "KINETIC APPROACH TO THE MEASUREMENT OF CHEMICAL OXYGEN DEMAND WITH AN AUTOMATED MICRO BATCH ANALYZER", ANALYTICAL CHEMISTRY, AMERICAN CHEMICAL SOCIETY. COLUMBUS, US, vol. 62, no. 4, 15 February 1990 (1990-02-15), pages 395 - 402, XP000134506, ISSN: 0003-2700 * |
Cited By (13)
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US9086156B2 (en) | 2011-05-11 | 2015-07-21 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Analytical device for automated determining of a measured variable of a measured liquid |
DE102011075762A1 (de) | 2011-05-12 | 2012-11-15 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Analysegerät zur automatisierten Bestimmung einer Messgröße einer Messflüssigkeit |
CN102279123A (zh) * | 2011-06-14 | 2011-12-14 | 聚光科技(杭州)股份有限公司 | 一种前处理方法和装置 |
DE102013114138A1 (de) | 2013-12-16 | 2015-06-18 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Aufschlussreaktor und Analysegerät zur Bestimmung eines Aufschlussparameters einer Flüssigkeitsprobe |
US20150168373A1 (en) * | 2013-12-16 | 2015-06-18 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Analytical device for determining a digestion parameter of a liquid sample |
US10295458B2 (en) | 2013-12-16 | 2019-05-21 | Endress+Hauser Conducta Gmbh+Co. Kg | Analytical device for determining a digestion parameter of a liquid sample |
CN104458733A (zh) * | 2014-12-17 | 2015-03-25 | 河北先河环保科技股份有限公司 | 一种比色法氨氮自动监测仪消解比色装置 |
US10161781B2 (en) * | 2015-09-28 | 2018-12-25 | Endress+Hauser Conducta Gmbh+Co. Kg | Device for dispensing a liquid |
US20170089750A1 (en) * | 2015-09-28 | 2017-03-30 | Endress+Hauser Conducta Gmbh+Co. Kg | Device for dispensing a liquid |
CN106053202A (zh) * | 2016-06-12 | 2016-10-26 | 山东思睿环境设备科技有限公司 | 高温高压消解比色装置 |
CN106124287A (zh) * | 2016-06-13 | 2016-11-16 | 山东思睿环境设备科技有限公司 | 高温高压消解光纤比色系统 |
CN107831121A (zh) * | 2017-11-22 | 2018-03-23 | 江苏蓝创智能科技股份有限公司 | 多参数水质检测仪及其使用方法 |
CN107831121B (zh) * | 2017-11-22 | 2024-03-01 | 江苏蓝创智能科技股份有限公司 | 多参数水质检测仪及其使用方法 |
Also Published As
Publication number | Publication date |
---|---|
DE10360066A1 (de) | 2005-07-21 |
CN1629623A (zh) | 2005-06-22 |
TW200526956A (en) | 2005-08-16 |
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