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1、INTERNATIONAL STANDARD IS0 10530 First edition 1992-09-15 Water quality - Determination of dissolved sulfide - Photometric method using methylene blue Qualife de I eau - Dosage des sulfures dissous - Mdfhode phofomkfrique au bleu de mdfhyl is the calculated absorbance of the blank (see 7.2); is the
2、subscript indicating the path length of the cuvette; is the conversion factor, here / = 100 ml; is a measure of the sensitivity, in litres per milligram, obtained according to clause 8; is the volume of the filtrate used for the analysis, here I/ = 45 ml. When calculating the results, any dilution s
3、teps shall be taken into account. 10 Expression of results The mass concentration of dissolved sulfide in a water sample shall be rounded to the nearest 0.01 mg, but not more than two significant digits shall be reported. Example: Dissolved sulfide: 0,55 mg/l 11 Performance characteristics As the fi
4、ltration of the non-stabilized sample is part of this International Standard, and the common practice of shipping samples was not feasible due to the instability of the dissolved sulfide, a com- parative study was carried out in place of an inter- laboratory trial. This comparative study was perform
5、ed by analysts from various institutes in one laboratory. A sulfide solution containing 1 mg/l of sulfide was used for the determination. The following calibration function was established by the host laboratory prior to the meeting: y = 0,010 79.x + 0,022 8 The performance characteristics are given
6、 in table 1. NOTE 1 For all participants reporting more than four blank values, the first four values were included in the evaluation. 12 Test report The test report shall include the following infor- mation: a) a reference to this International Standard; b) identity of the water sample: c) expressi
7、on of results, in accordance with clause 10; d) sample pretreatment; e) any deviation from this method and any other circumstances which may have influenced the results. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards
8、1/9972545001 Not for Resale, 04/23/2007 21:46:13 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 10530:1992(E) Table 1 - Performance characteristics = 4 X *r “Cr OR vcR Parameter I ?I % f-w/l w/l % n-d % Sample 7 28 o,o 1,152 0.020 6 13 0,020 9 198 I is the number of pa
9、rticipants n is the number of measuring values 4 is the percentage of outliers = X is the mean value =r is the repeatability standard deviation vcr is the repeatability variation coefficient UR is the reproducibility standard deviation vcR is the reproducibility variation coefficient 8 Copyright Int
10、ernational Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:46:13 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 10530:1992(E) Annex A (normative) Standardization of sul
11、fide stock solution Pipette 25 ml of iodine solution (c = 0,05 mol/l) into a 250 ml Erlenmeyer flask and dilute to approxi- mately 100 ml with water. Add 10 ml of acetic acid and pipette 50 ml of sodium sulfide stock solution (4.8) into the diluted iodine solution. Allow the mixture to react for abo
12、ut 3 min Titrate the excess iodine using sodium thiosulfate solution (c = 0,l mol/l) until the colour turns to pale yellow. Add starch solution and titrate until the sol- ution turns colourless. Calculate the concentration of the sulfide stock sol- ution, in milligrams per litre, using the formula (
13、I , - V,)1,604100 50 where is the volume, in millilitres, of the iodine solution; if2 is the volume, in millilitres, of the sodium thiosulfate solution consumed; 1,604 is the stoichiometric factor. Copyright International Organization for Standardization Provided by IHS under license with ISO Licens
14、ee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:46:13 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 10530:1992(E) -.-:=f-.-_-_-.- -_.- UDC 614.777:556.114:543.42:546.221 Descriptors: water, quality, chemical analysis, determination of content, s
15、ulphides. photometric method. Price based on 9 pages . -. -_ - -_ -.- .-.- - Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:46:13 MDTNo reproduction or networking permitted without license from IHS -,-,-