DIN ISO 17289-2014 Water quality - Determination of dissolved oxygen - Optical sensor method (ISO 17289 2014)《水质 溶解氧的测定 光学传感器法 (ISO 17289-2014)》.pdf

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1、December 2014Translation by DIN-Sprachendienst.English price group 12No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC

2、S 13.060.50!%Zr“2275579www.din.deDDIN ISO 17289Water quality Determination of dissolved oxygen Optical sensor method (ISO 17289:2014),English translation of DIN ISO 17289:2014-12Wasserbeschaffenheit Bestimmung des gelsten Sauerstoffs Optisches Sensorverfahren (ISO 17289:2014),Englische bersetzung vo

3、n DIN ISO 17289:2014-12Qualit de leau Dosage de loxygne dissous Mthode optique la sonde (ISO 17289:2014),Traduction anglaise de DIN ISO 17289:2014-12www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1901.15 A comma is used as the dec

4、imal marker. Contents Page National foreword .3 National Annex NA (informative) Bibliography 5 1 Scope 6 2 Normative references 6 3 Principle 6 4 Interferences 7 5 Reagents .7 6 Apparatus .7 7 Procedure .8 7.1 Sampling .8 7.2 Measuring technique and precautions to be taken 8 7.3 Calibration 9 7.4 De

5、termination .9 8 Calculation and expression of results .10 8.1 Dissolved oxygen concentration .10 8.2 Dissolved oxygen expressed as percentage saturation .10 9 Test report 1 Annex A (informative) Physico-chemical data of oxygen in water 12 Annex B (informative) Performance data 18 Bibliography 19 1D

6、IN ISO 17289:2014-12 2 DIN ISO 17289:2014-12 3 National foreword The text of this document (ISO 17289:2014) has been prepared by Technical Committee ISO/TC 147 “Water quality” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the DIN-Normenausschuss Wasserwesen

7、 (DIN Standards Committee Water Practice), Working Group NA 119-01-03-01-21 AK Gelstsauerstoffmessung of Working Committee NA 119-01-03 AA Wasseruntersuchung. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN shall not be held r

8、esponsible for identifying any or all such patent rights. Designation of the method: Determination of dissolved oxygen Optical sensor method (G 25): Method DIN ISO 17289 G 25 For the national implementation of this standard in Germany, the following should be noted: In some cases, it will only be po

9、ssible to apply the provisions of this standard (e.g. those in Subclause 7.2 or 7.3.1) to continuous measurements to a limited extent, or the provisions will have to be modified, because the framework conditions in some cases make it difficult, or even impossible, to implement these provisions. For

10、example, Subclause 7.2 specifies that there is to be no exchange of oxygen from a gas reservoir to the sample, or vice versa, because the formation of air bubbles will influence the measurement signal. But in practice, e.g. in an aeration tank of a sewage treatment plant, such an exposure to air is

11、not always avoidable because the sensors are directly in the stream of air bubbles. Thus, continuous measuring systems shall be selected so as to minimize this influence. As regards Subclause 7.3.1, users of this standard should note that the calibration of laboratory measuring equipment at air satu

12、ration should be checked daily and after relevant changes of ambient conditions (i.e. temperature or pressure). For continuous measuring systems the manufacturers instructions are to be consulted. In Table A.3 “Concentration of oxygen in water equilibrated with water-saturated air at atmospheric pre

13、ssure (1 013 hPa) (for salinity, see Table A.1)” the value given for the oxygen concentration at a salinity of 36 and a temperature of 39,0 C is incorrect; it should be 5,41 mg/l (according to Weiss, R. F.: The solubility of nitrogen, oxygen and argon in water and seawater. (1970) Deep-Sea Research

14、17, 721-735). The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 3696 DIN ISO 3696 ISO 5813 DIN EN 25813 ISO 5814 DIN EN ISO 5814 ISO 7888 DIN EN 27888 DIN ISO 17289:2014-12 4 Expert assistance and specialized laboratories will be required

15、 to perform the analyses described in this standard. Existing safety requirements are to be observed. Depending on the objective of the analysis, a check shall be made on a case-by-case basis as to whether and to what extent additional conditions will have to be specified. This standard has been pre

16、pared by the DIN-Normenausschuss Wasserwesen (DIN Standards Committee Water Practice) in collaboration with the Wasserchemische Gesellschaft Fachgruppe in der Gesellschaft Deutscher Chemiker (Water Chemistry Society Division of the German Chemical Society). It is part of the series Deutsche Einheits

17、verfahren zur Wasser-, Abwasser- und Schlammuntersuchung (German standard methods for the examination of water, waste water and sludge): Determination of dissolved oxygen Optical sensor method (G 25): Standard methods published as DIN Standards are obtainable from Beuth Verlag GmbH, either individua

18、lly or grouped in volumes. The standard methods included in the loose-leaf publication entitled Deutsche Einheitsverfahren zur Wasser-, Abwasser- und Schlammuntersuchung will continue to be published by Beuth Verlag GmbH and Wiley-VCH Verlag GmbH small scratches mostly do not matter (refer to manual

19、); the system has to be calibrated when necessary (refer to manual).When a measurement is performed, ensure that the sample flows past the sensor cap with sufficient velocity to obtain a homogenous sample and a rapid reading. This can be achieved by natural streaming, movement of the sensor, or stir

20、ring e.g. with a magnetic stirrer (refer to manual).Take care that there is no exchange of oxygen from a gas reservoir to the sample or vice versa. Therefore avoid formation of any air bubbles in the samples that are measured in a vessel. When measuring on-site, do not generate any air bubbles, as t

21、hese can affect the signal.For storing and maintenance of the probe, consult the manufacturers manual.DIN ISO 17289:2014-12 8 7.3 Calibration7.3.1 GeneralThe procedure is described in 7.3.2 to 7.3.3, but it is also necessary to consult the manufacturers instructions.Calibration at air saturation sho

22、uld be checked daily and after relevant changes of ambient conditions (i.e. temperature or pressure).7.3.2 Checking the zeroIf necessary, check and, if possible, adjust the zero setting of the instrument by immersing the probe in 1 l of water to which the equivalent of 1 g or more sodium sulfite is

23、added (5.2) (the solution is usable after adequate reaction time, when a stable reading is achieved). About 1 mg of cobalt(II) salt (5.3) can be added to increase the reaction rate. Alternatively, 100 ml of an alkaline ascorbic acid solution can be used. The alkaline ascorbic acid solution is prepar

24、ed by dissolving 2 g ascorbic acid (5.4) and 25 ml 1 mol/l NaOH (5.5) in 85 ml deionised water in a suitable vessel with stopper (for total 110 ml volume). Start stirring slowly; wait 3 min before use. Use a reagent that is applicable for checking the zero according to the manufacturers manual.WARNI

25、NG Water soluble cobalt(II) salts are toxic to humans and to aquatic life. Handling with care is necessary.NOTE 1 Typical reaction times without cobalt(II) are 20 min, with cobalt(II) 5 min, and with alkaline ascorbic acid 30 min.The zero checking and setting, if possible, can also be performed by u

26、sing a pure nitrogen (5.6) atmosphere.NOTE 2 Dry conditions are possible according to some manufacturers manuals.Modern probes typically achieve a stable response within some minutes. However, different probes can have different response rates and the manufacturers instruction should be consulted. I

27、f stirring is required according to the manufacturers manual, carry out the stirring in such a way thata) the response time is minimized andb) no oxygen from the atmosphere is mixed in.7.3.3 Calibration at saturationPerform the calibration in an applicable container according to the manufacturers ma

28、nual. Simple and effective calibration is possible in water vapour saturated air.Replace the sensor cap when the instrument can no longer be calibrated, when the meter software does not accept the sensor cap response, or when the response becomes unstable or slow (see the manufacturers instructions)

29、.NOTE Values can be checked by the Winkler titration (see ISO 5813).7.4 DeterminationCarry out the determination on the water to be analysed according to manufacturers instructions.Gently agitate the sample, e.g. by stirring (see 7.2), if recommended by the manufacturer. Check the influencing variab

30、les like sample temperature, atmospheric pressure, and salinity of sample.DIN ISO 17289:2014-12 9 N1) National footnote: See National forword. N1)Immerse the measuring probe sensor in the sample, allowing an intensive contact of the sensor cap and the temperature sensor with the water.NOTE 2 Most in

31、struments compensate for the temperature behavior. In %-mode, they take into account the atmospheric pressure for the computation of the final reading. When using instruments without these automatic functions, the influence of temperature and pressure have to be considered by the user (see Annex A).

32、8 Calculation and expression of results8.1 Dissolved oxygen concentrationExpress the dissolved oxygen concentration, in milligrams of oxygen per litre, and report the result to the first decimal place.EXAMPLE 1 (O2) = 1,5 mg/l.EXAMPLE 2 (O2) = 18,2 mg/l.8.2 Dissolved oxygen expressed as percentage s

33、aturationMost instruments are equipped with an automatic calculation. If required, calculate the percentage saturation of dissolved oxygen in water fromw OOOth222100()=()()(1)wherew(O2) is the percentage saturation of dissolved oxygen in water, expressed in percent, %;(O2) is the actual concentratio

34、n, expressed in milligrams per litre, mg/l, of dissolved oxygen found in a water sample at a barometric pressure p, at a water temperature ;(O2)this the theoretical concentration, expressed in milligrams per litre, mg/l, of oxygen for that sample at the barometric pressure p and the temperature , if

35、 the sample were saturated with moist air (see Annex A).Report the result to the nearest whole number. The water temperature and barometric pressure p at the measurement, and salinity S of the sample when the latter was taken into account, shall be given (see Clause 9).EXAMPLE 1 w(O2) = 3 %p = 1 115

36、 hPa; = 19,5 C; S = 35EXAMPLE 2 w(O2) = 104 %p = 1 005 hPa; = 22,1 C; S = 3DIN ISO 17289:2014-12 10 NOTE 1 For information on how the concentration of oxygen is dependent on temperature, pressure, and salinity, see Annex A.c) the measuring conditions (if necessary): the temperature of the water when

37、 the sample was taken and when the measurement was carried out; the atmospheric pressure when the sample was taken and when the measurement was carried out; the salinity of the water;d) the result in accordance with Clause 8;e) all circumstances that might have influenced the result.DIN ISO 17289:20

38、14-12 11 9 Test reportThe test report shall contain at least the following information:a) the test method used, together with a reference to this International Standard (i.e. ISO 17289:2014);b) the identity of the water samples;Annex A (informative) Physico-chemical data of oxygen in waterA.1 Salini

39、ty and conductivityUse the values in Table A.1 if the conductivity meter in use does not measure salinity. Use a conductivity meter to determine conductivity at reference temperature (20 C), then use Table A.1 to estimate the salinity to the nearest whole number.If the conductivity meter is only abl

40、e to display the conductivity at another reference temperature, the conductivity at 20 C has to be calculated by a correction factor (see ISO 7888).Table A.1 was calculated up to the conductivity of 5,4 S/m from the International Oceanographic Tables.7Table A.1 Correlation conductivity SalinityCondu

41、ctivityS/mbSalinity valueaConductivityS/mbSalinity valueaConductivityS/mbSalinity valuea0,5 3 2,0 13 3,5 250,6 4 2,1 14 3,6 250,7 4 2,2 15 3,7 260,8 5 2,3 15 3,8 270,9 6 2,4 16 3,9 281,0 6 2,5 17 4,0 291,1 7 2,6 18 4,2 301,2 8 2,7 18 4,4 321,3 8 2,8 19 4,6 331,4 9 2,9 20 4,8 351,5 10 3,0 21 5,0 371,

42、6 10 3,1 22 5,2 381,7 11 3,2 22 5,4 401,8 12 3,3 23 1,9 13 3,4 24 aSalinity determined from conductivity at 20 C.b1 S/m = 10 mmhos/cm.A.2 Barometric pressure and elevationTable A.2 is used to estimate the true barometric pressure at certain elevations. The correspondence is based on the assumption t

43、hat at sea level the barometric pressure is 1 013 hPa. After taking the DIN ISO 17289:2014-12 12 barometric pressure depending on the elevation from Table A.2 or more precisely from a local weather service, enter this value into the instrument.NOTE 1 The values given in Table A.2 are an approximatio

44、n according to the international barometric formula and can differ in respect of other data based on different but also possible equations.NOTE 2 Corrections of the barometric pressure only have to be made if the instrument does not do this automatically.Table A.2 Elevation barometric pressure (exam

45、ple)ElevationmBarometric pressurehPaElevationmBarometric pressurehPa0 1 013 1 800 815150 995 1 950 800300 979 2 100 785450 960 2 250 771600 943 2 400 756750 926 2 550 742900 910 2 700 7281 050 893 2 850 7151 200 877 3 000 7011 350 861 3 150 6881 500 846 3 300 6751 650 830 A.3 Concentration of oxygen

46、 in waterSee Tables A.3, A.4, and A.5.Table A.3 Concentration of oxygen in water equilibrated with water-saturated air at atmospheric pressure (1 013 hPa) (for salinity, see Table A.1)TemperatureCOxygen concentration (mg/l)Salinity0 9 18 27 360,0 14,62 13,73 12,89 12,11 11,371,0 14,22 13,36 12,55 11

47、,79 11,082,0 13,83 13,00 12,22 11,49 10,803,0 13,46 12,66 11,91 11,20 10,544,0 13,11 12,34 11,61 10,93 10,285,0 12,77 12,03 11,33 10,66 10,046,0 12,45 11,73 11,05 10,41 9,817,0 12,14 11,44 10,79 10,17 9,588,0 11,84 11,17 10,54 9,94 9,379,0 11,56 10,91 10,29 9,71 9,1610,0 11,29 10,66 10,06 9,50 8,971

48、1,0 11,03 10,42 9,84 9,29 8,78DIN ISO 17289:2014-12 13 TemperatureCOxygen concentration (mg/l)Salinity0 9 18 27 3612,0 10,78 10,19 9,63 9,09 8,5913,0 10,54 9,96 9,42 8,90 8,4214,0 10,31 9,75 9,22 8,72 8,2515,0 10,08 9,54 9,03 8,55 8,0916,0 9,87 9,35 8,85 8,38 7,9317,0 9,67 9,15 8,67 8,21 7,7818,0 9,

49、47 8,97 8,50 8,05 7,6319,0 9,28 8,79 8,34 7,90 7,4920,0 9,09 8,62 8,18 7,75 7,3521,0 8,92 8,46 8,02 7,61 7,2222,0 8,74 8,30 7,88 7,47 7,0923,0 8,58 8,14 7,73 7,34 6,9724,0 8,42 8,00 7,59 7,21 6,8525,0 8,26 7,85 7,46 7,09 6,7326,0 8,11 7,71 7,33 6,97 6,6227,0 7,97 7,58 7,20 6,85 6,5128,0 7,83 7,45 7,08 6,73 6,4029,0 7,69 7,32 6,96 6,62 6,3030,0 7,56 7,20 6,85 6,52 6,2031,0 7,43 7,07 6,74 6,41 6,1032,0 7,31 6,96 6,63 6,31 6,0133,0 7,