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HJ 674-2013 English PDF

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HJ 674-2013: Water quality. Determination of hydrazine and monomethyl hydrazine by p-Dimethylaminobenzaldehyde spectrophotometric method
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
HJ 674-2013	English	339	Add to Cart	3 days [Need to translate]	Water quality. Determination of hydrazine and monomethyl hydrazine by p-Dimethylaminobenzaldehyde spectrophotometric method	Valid	HJ 674-2013

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Standard similar to HJ 674-2013

GB 5085.7 HJ 694 GB 5085.1 HJ 667 HJ 668 HJ 666

Basic data

Standard ID	HJ 674-2013 (HJ674-2013)
Description (Translated English)	Water quality. Determination of hydrazine and monomethyl hydrazine by p-Dimethylaminobenzaldehyde spectrophotometric method
Sector / Industry	Environmental Protection Industry Standard
Classification of Chinese Standard	Z16
Classification of International Standard	13.060
Word Count Estimation	13,18
Older Standard (superseded by this standard)	GB/T 15507-1995; GB/T 14375-1993
Quoted Standard	GB/T 14376
Regulation (derived from)	Department of Environmental Protection Notice No. 70 of 2013
Issuing agency(ies)	Ministry of Ecology and Environment
Summary	This standard specifies the Determination of hydrazine and monomethyl hydrazine dimethylaminobenzaldehyde spectrophotometry. This standard is divided into two parts: the first part is the spectrophotometric determination of hydrazine on dimethylaminobenza

HJ 674-2013: Water quality. Determination of hydrazine and monomethyl hydrazine by p-Dimethylaminobenzaldehyde spectrophotometric method

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Water quality.Determination of hydrazine and monomethyl hydrazine by p-Dimethylaminobenzaldehyde spectrophotometric method National Environmental Protection Standard of the People's Republic Replace GB/T 15507-1995, GB/T 14375-1993 Water quality and determination of methylhydrazine - Dimethylaminobenzaldehyde Water quality-Determination of hydrazine and monomethyl hydrazine by p-Dimethylaminobenzaldehyde spectrophotometric method Released on.2013-11-21 2014-02-01 implementation Release Ministry

Preface II The first part of the determination of 肼 1 1 Scope 1 2 Principle of the method 1 3 interference and elimination 1 4 reagents and materials 1 5 Instruments and equipment 2 6 samples. 2 7 Analysis step 2 8 result calculation 3 9 Precision and accuracy 4 10 Quality Assurance and Control 4 11 Waste Disposal 4 The second part of the determination of methyl hydrazine 4 1 Scope .4 2 Reference Standard 5 3 Principle of the method 5 4 interference and elimination..5 5 reagents and materials..5 6 Instruments and equipment 6 7 samples.6 8 Analysis steps..6 9 result calculation 7 10 precision and accuracy..7 11 Quality Assurance and Quality Control..8 12 Waste disposal 8

Foreword

To implement the Environmental Protection Law of the People's Republic of China and the Law of the People's Republic of China on Water Pollution Prevention and Control, to protect the environment, To ensure human health, standardize the monitoring and analysis methods for strontium and methyl hydrazine in water, and develop this standard. This standard specifies the p-dimethylaminobenzaldehyde spectrophotometric method for the determination of hydrazine and methylhydrazine in water. This standard applies to the determination of bismuth and methyl hydrazine in surface water, groundwater, domestic wastewater and industrial wastewater. This standard is for the determination of water quality 对 dimethylaminobenzaldehyde spectrophotometry (GB/T 15507-1995) and "water Determination of quinone monomethyl hydrazine, revision of dimethylaminobenzaldehyde spectrophotometry (GB/T 14375-1993), original standard for the first time Published in.1995 and.1993. The main drafting units of the original standard are respectively, GB/T 15507-1995. Dandong City, Liaoning Province Bao Institute, the 7th Design and Research Institute of the former Aerospace Department, Xi'an Qinghua Electrical Appliance Factory of the former Ministry of Weapons Industry; GB/T 14375-1993. The Seventh Design and Research Institute of the former Aerospace Department. This standard is divided into two parts. the first part is the determination of hydrazine by p-dimethylaminobenzaldehyde spectrophotometry; the second part is the second part Methylaminobenzaldehyde spectrophotometric determination of methyl hydrazine. This standard is the first revision, the main revisions are as follows. Divided into the determination of bismuth, the second part is the determination of methyl hydrazine; - Modification of the method for eliminating nitrite interference by substituting p-diaminosulfonic acid for sodium azide; -- Revised the editorial errors and formats that appeared in the original standard. From the date of implementation of this standard, "Determination of water quality 对 dimethylaminobenzaldehyde spectrophotometry" (GB/T 15507-1995) and "Determination of water-methyl hydrazine by p-dimethylaminobenzaldehyde spectrophotometry" (GB/T 14375-1993) Abolished. This standard is revised by the Science and Technology Standards Department of the State Environmental Protection Administration. The main revision unit of this standard. National Environmental Analysis and Testing Center, China Aerospace Science and Technology Group Sixth Institute 101 (China Airlines Day Liquid Propellant Research Center). The units that participate in the verification of this standard are. National Environmental Analysis and Testing Center, China Aerospace Liquid Propellant Research Center, North Beijing Municipal Environmental Protection Monitoring Center, Beijing Physical and Chemical Testing Center, Propellant Testing and Protection Center of the General Armament Department, Army of General Equipment Department Equipment research and ordering department anti-chemical metering station. This standard was approved by the Ministry of Environmental Protection on November 21,.2013. This standard has been implemented since February 1,.2014. This standard is explained by the Ministry of Environmental Protection. Water quality and determination of methylhydrazine - dimethylaminobenzaldehyde spectrophotometric method This standard specifies the p-dimethylaminobenzaldehyde spectrophotometric method for the determination of hydrazine and methylhydrazine in water. This standard is divided into two parts. The first part is spectrophotometric determination of hydrazine with p-dimethylaminobenzaldehyde, and the second part is p-dimethylaminobenzaldehyde spectrophotometry. The methyl hydrazine was measured. The first part of the determination of 肼

1 Scope of application

This standard specifies the p-dimethylaminobenzaldehyde spectrophotometric method for the determination of hydrazine in water. This standard applies to the determination of bismuth in water and industrial wastewater. According to the water sample 50mL, using the 5cm absorption pool calculation, the detection limit of this method is 0.003 mg/L, the quantitative measurement The circumference is (0.012~0.240) mg/L. If a 1cm absorption cell is used, the detection limit is 0.015 mg/L, and the quantitative determination range is (0.060~1.00) mg/L. When the concentration of strontium in the water sample is greater than 1.00 mg/L, it can be determined after dilution.

2 Principle of the method

Under acidic conditions, hydrazine reacts with p-dimethylbenzaldehyde to form p-dimethylaminobenzyl nitrogen yellow compound. in The absorbance is measured at a wavelength of 458 nm, and its absorbance is proportional to the content of germanium in a certain concentration range.

3 interference and elimination

Interference determination of semicarbazide, thiourea and urea at 20 mg/L, 50 mg/L and.200 mg/L respectively; methyl hydrazine is strontium content There is interference when 3 times. When the water sample contains chromium, add 2mL HCl (4.2) to 10mL water sample, add 0.4mL 1% potassium iodide, shake Evenly, let stand for 10 minutes. When the NO2 ̄ in the water sample is greater than 1 mg/L, it will have negative interference with the determination. When the concentration of NO2 ̄ in the water sample is 1.0mg/L~4.5mg/L, Add 1.0 mL of ammonium sulfamate or sulfamic acid solution (4.5) to 10 mL of water and shake well to complete the reaction. To eliminate interference. For different NO2 concentration, adjust the amount of sulfamic acid added in the above ratio.

4 reagents and materials

The reagents used in this standard are analyzed using analytical analytical reagents in accordance with national standards, unless otherwise stated. The water is freshly prepared deionized or distilled water. 4.1 Hydrochloric acid (HCl). ρ = 1.19 g/mL. 4.2 Hydrochloric acid solution. c (HCl) = 0.12 mol/L. Take 250mL beaker, add.200 water, hydrochloric acid (4.1) 5.0mL, stir evenly, transfer to 500mL volumetric flask, use water Dilute to the mark and shake well. Transfer to a 500mL reagent bottle for later use. 4.3 Ethanol (95%). 4.4 p-Dimethylaminobenzaldehyde solution Weigh 4.0 g of p-dimethylaminobenzaldehyde in.200 mL of 95% ethanol and 20.0 mL of hydrochloric acid (4.1) and store in brown. Keep it in the bottle and protect it from light. 4.5 Ammonium sulfamate or sulfamic acid solution. ρ = 5.0 mg/mL. 0.50 g of ammonium sulfamate (NH4SO3NH2) or sulfamic acid (NH2SO3H) was weighed and dissolved in 100 mL of water. 4.6 肼 standard stock solution. ρ (N2H4) = 100 mg/L. Weigh 0.3280g of guanidine hydrochloride (N2H4·2HCl) or 0.4060g of barium sulfate (N2H4 H2SO4) in a beaker and add HCl to dissolve. Solution (4.1) 10.0mL was dissolved, quantitatively transferred into a 1000 mL volumetric flask, diluted with water to the mark line for use. Can also use the certificate Quasi sample. 4.7 肼 standard use solution. ρ (N2H4) = 1.00 mg/L. Pipette 10.0 mL of standard stock solution (4.6) into a 1000 mL volumetric flask, add HCl solution (4.1) 10.0 mL, and use water. Dilute to the mark.

5 Instruments and equipment

Unless otherwise stated, the analysis used a Class A glass gauge in accordance with national standards. 5.1 Spectrophotometer. with 1 cm and 5 cm absorption cells. 5.2 with colorimetric tube. 50mL, 100mL. 5.3 Laboratory general instruments.

6 samples

6.1 Acquisition and preservation Glass bottles were used for sampling and storage of samples. After sampling, the water sample was immediately acid or alkali to neutral and measured within 24 hours. 6.2 Water sample pretreatment If the water sample (6.1) contains tiny solid particles, it can be filtered with a quick filter paper, and a few milliliters of water that has started to be filtered out is discarded. After the sample, the filtrate is ready for use or centrifuged. 6.3 Sample preparation Take 100mL colorimetric tube, add water sample to 50mL mark, add HCl solution (4.1) 1.0mL, dilute with water to 100mL Marking.

7 Analysis steps

7.1 Determination of radon in surface water and groundwater 7.1.1 Calibration Take 5 50mL plug colorimetric tubes and add 肼 standard solution (4.7), 0, 0.50, 1.00, 1.50, 2.00, 3.00 mL, Dilute to 50 mL mark with HCl solution (4.2), add 10.0 mL of p-dimethylaminobenzaldehyde solution, mix and let stand for 20 min. Using a 5 cm absorption cell at a wavelength of 458 nm with distilled water as a reference, measure the absorbance, and take the barium content as the abscissa, deduct the test. The absorbance of the blank standard solution is plotted on the ordinate and a calibration curve is drawn. Linear regression analysis method is used to determine the slope for the sample. Product content calculation. 7.1.2 Sample determination Take water sample (6.3) in a 50 mL dry plug colorimetric tube and carefully add water to the 50 mL mark. Add 10.0mL Mix p-dimethylaminobenzaldehyde solution (4.4). After 20 minutes, use a 5 cm absorption cell at 458 nm wavelength with distilled water as reference. Ratio, measure absorbance. 7.2 Determination of high concentration bismuth 7.2.1 Calibration Take 5 50mL plug color tubes and add 肼 standard solution (4.7), 0, 2.00, 4.00, 6.00, 8.00, 10.0 mL, Dilute to 25 mL with HCl solution (4.2), add 5.0 mL of p-dimethylaminobenzaldehyde solution, mix and let stand for 20 min. Using a 1 cm absorption cell at a wavelength of 458 nm with distilled water as a reference, measuring the absorbance, taking the yttrium content as the abscissa, deducting the test The absorbance of the blank standard solution is plotted on the ordinate and a calibration curve is drawn. Linear regression analysis method is used to determine the slope for the sample. Product content calculation. 7.2.2 Sample determination Take water sample (6.3) in a 25mL dry colorimetric tube and carefully add to the 25mL mark (if industrial wastewater The concentration is higher, you can take water sample (6.3) 1.0mL, 5.0mL or 10.0mL as needed, then dilute with HCl solution (4.2) Up to 25mL mark). Add 5.0 mL of p-dimethylaminobenzaldehyde solution (4.4) and mix. Use a 1 cm absorption tank after 20 minutes The absorbance was measured at 458 nm using distilled water as a reference.

8 Calculation of results

8.1 Calculation of results The 肼 content ρ (mg/L) in the sample is calculated as follows. ρ = Vb AAk × −× )( 0 Where. A - absorbance of the sample solution; A0 - reagent blank liquid absorbance; b -- the slope of the calibration curve obtained by linear regression analysis; V -- Analyze the sample volume (for example, surface water, ground water is 50mL, industrial wastewater is the actual sample body) Product, such as 1.0, 5.0, 10.0 or 25.0mL); k -- dilution factor (where k=2). If the measurement result is in hydration enthalpy, multiply the result by 1.56. Because 1.56 parts of N2H4·H2O contains 1 part of N2H4. 8.2 Results representation When the result is greater than or equal to 0.100 mg/L, the calculation results take 3 significant figures; when the result is less than 0.100 mg/L, Leave to the third digit after the decimal point.

9 Precision and accuracy

9.1 precision Six laboratories measured the uniform water samples with a concentration of 0.021 mg/L, 0.152 mg/L, and 0.392 mg/L. The relative standard deviations in the laboratory are 0.5-6.1 (%), 0.6-5.7 (%), 0.3-2.5 (%); the relative standard between laboratories The deviations were 13.1%, 7.0%, and 5.0%, respectively. The repeatability limits were 0.0019 mg/L, 0.011 mg/L, and 0.017 mg/L, respectively. Reproduce The sexual limits were 0.0078 mg/L, 0.031 mg/L, and 0.057 mg/L, respectively. 9.2 Accuracy Six laboratories added 0.020 mg/L and 0.10 mg/L to surface water and 0.10 mg/L and 0.40 mg/L for industrial wastewater. The four samples were measured separately, and the recoveries (%) of the spiked results ranged from 96.9 to 102.2; 98.6 to 103.0; 95.5 ~ 101.6; 98.1 ~ 103.7. The recoveries were 101.2 ± 8.6; 100.2 ± 3.0; 98.7 ± 4.4; 103.0 ± 4.4. 10 Quality Assurance and Control 10.1 The standard addition method can be used to compare the results of the standard working curve method to determine whether matrix interference exists in the sample. The relative deviation between the two results is within 10%, and the matrix interference is negligible. If it is greater than 10%, it can be judged that the base exists in the sample. Body interference. In the same way, the calibration curve method was used to prepare and process the sample, and ammonium sulfamate was added to eliminate the interference. 10.2 There should be one full procedural blank for each batch (≤10) of samples analyzed. 10.3 Each batch (≤10) of samples must have a blank spike and the recovery rate is between 90% and 110%. 10.4 There should be one parallel sample for each batch (≤10) of samples analyzed. When the quantity is large, the number of parallel samples should be selected in proportion to 10%. The relative deviation of the parallel sample results should be less than 10%. 10.5 The correlation coefficient of the calibration curve regression equation developed each time should be greater than 0.999. 11 Waste disposal The waste liquid generated in the experiment should be collected regularly and safely treated according to laboratory waste. Entrust qualified units when necessary Dispose of. The second part of the determination of methyl hydrazine

1 Scope

This standard specifies the p-dimethylaminobenzaldehyde spectrophotometric method for the determination of methylhydrazine in water. This standard applies to the determination of methyl hydrazine in water and industrial wastewater. Calculated according to the use of 2cm absorption tank and 15 mL of surface water. The detection limit of methyl hydrazine is 0.015 mg/L. It is (0.060~1.50) mg/L. When the methyl hydrazine content in the water sample is greater than 1.50 mg/L, it can be determined after dilution.

2 Reference standard

The contents of this standard refer to the following documents. For undated references, the valid version applies to this standard. GB/T 14376 Determination of dimethyl hydrazine in water - Amino ferrocyanide spectrophotometric method

3 Principle of the method

Under acidic conditions, methyl hydrazine reacts with p-dimethylaminobenzaldehyde to form a yellow condensate, which is measured at a wavelength of 470 nm. The amount of absorbance. The absorbance is proportional to the content of methyl hydrazine in a certain concentration range.

4 interference and elimination

肼 Interfering with the determination of methyl hydrazine. When the content of dimethyl hydrazine is higher than that of methyl hydrazine, it can be corrected by a calibration curve.

5 reagents and materials

The reagents used in this standard are analyzed using analytical analytical reagents in accordance with national standards, unless otherwise stated. The water is freshly prepared deionized or distilled water. 5.1 Sulfuric acid. ρ = 1.84 g/mL. 5.2 Ethanol. 95% or more. 5.3 Methyl hydrazine (CH3NHNH2). purity 98% or more. 5.4 Sulfuric acid solution. c(H2SO4) = 1.0 mol/L. Add 50 mL of water to a 500 mL beaker, slowly inject 27.8 mL of sulfuric acid (5.1), and transfer to a 500 mL capacity after stirring. Dilute the bottle to the mark with water and shake well. Transfer to a 500mL reagent bottle for later use. 5.5 Sulfuric acid solution. c(H2SO4) = 0.050 mol/L. Add 100 mL of water to a 1000 mL beaker, slowly inject 50 mL of sulfuric acid (5.4), and mix to transfer to 1000 mL capacity. Dilute the bottle to the mark with water and shake well. Transfer to a 1000mL reagent bottle for later use. 5.6 p-Dimethylaminobenzaldehyde solution. Weigh p-dimethylaminobenzaldehyde [(CH3)2NC6H4CHO] 5.0g, add 20mL sulfuric acid Solution (5.4), mix and add 100 mL of ethanol (5.2) to dissolve. 5.7 Ammonium sulfamate or sulfamic acid solution. ρ = 10 g/L. 1.0 g of ammonium sulfamate (NH4SO3NH2) or sulfamic acid (NH2SO3H) was weighed and dissolved in 100 mL of water. 5.8 methyl hydrazine standard stock solution. ρ = 10.0 mg/mL. Pipette 5 mL~10 mL sulfuric acid solution (4.4) into a 25 mL volumetric flask. The volumetric flask was weighed and weighed to 0.0001 g. Pipette approximately 0.25 mL to 0.30 mL of methyl hydrazine (4.3), pipette into the volumetric flask, and gently shake the bottle. Weighed again, weighed to 0.0001 g, and the amount of methyl hydrazine (4.3) added was 0.2500 g. Dilute to the mark with sulfuric acid solution (4.4). Or calculate the standard stock concentration based on the actual amount of methyl hydrazine (0.245~0.255) g added. 5.9 methyl hydrazine standard intermediate solution. ρ =.200 mg/L. Pipette 2.0 mL of methyl hydrazine stock solution (5.8), transfer to a 100 mL volumetric flask, and dilute to the mark with sulfuric acid solution (4.5). Store at 2 ° C ~ 5 ° C. 5.10 Standard solution for methylhydrazine. ρ=2.00 mg/L. Pipette 5.00mL of methyl hydrazine solution (5.9), transfer it to a 500mL volumetric flask, dilute to the mark with sulfuric acid solution (5.5), and mix. Prepared on the same day before use.

6 Instruments and equipment

6.1 Spectrophotometer. with 2 cm absorption cell. 6.2 General laboratory equipment. 6.2.1 Colorimetric tube. 25 mL, 100 mL. 6.2.2 Volumetric flask. 25mL, 100mL, 500mL.

7 samples

7.1 Acquisition and preservation Glass bottles were used for sampling and storage of samples. After sampling, the water sample was immediately acid or alkali to neutral and measured within 24 hours. 7.2 Water sample pretreatment If the water sample (7.1) contains tiny solid particles, it can be filtered with a quick filter paper, and a few milliliters of water that has started to be filtered out is discarded. After the sample, the filtrate is ready for use or centrifuged. 7.3 Sample preparation 7.3.1 Industrial wastewater. Take a 100 mL dry colorimetric tube and add the pretreated water sample (7.2) to the vicinity of the 50 mL mark. Carefully add dropwise to the mark, add 5.0 mL of sulfuric acid solution (5.4), dilute to 100 mL mark with water, and mix. 7.3.2 Surface water and groundwater. Measure the appropriate amount (100-200mL) into the beaker and adjust the pH value to 1.0 with sulfuric acid (5.1). Mix left and right.

8 Analysis steps

8.1 Calibration 8.1.1 Preparation of standard curve in the absence of nitrite Take a set of 25mL volumetric flasks or colorimetric tubes and add 0, 0.50, 1.00, 2.00, 3.00, 4.00mL of methyl hydrazine. Standard solution (4.10), add 4.5 mL of ethanol (5.2), add 5.0 mL of color developer (5.6), and dilute to the mark with sulfuric acid solution (5.5). Shake well. After standing for 40 min, use a 2 cm absorption cell to measure the absorption at 470 nm of the spectrophotometer with distilled water as the reference solution. Luminosity. After the absorbance is subtracted from the absorbance of the reagent blank, and the corresponding methyl hydrazine content is plotted, a calibration curve is drawn and linearly returned. The analysis method finds its slope. 8.1.2 Preparation of the standard curve in the presence of nitrite. after taking a set of methyl hydrazine standard solution according to 8.1.1, adding 0.2mL ammonia Ammonium hydride solution (5.7), the remaining steps are the same as in 8.1.1. 8.2 Sample determination 8.2.1 Determination of nitrite and other terpenes in water samples. Pipette 15 mL of water sample into a 25 mL volumetric flask or colorimetric tube, add 4.5 mL of ethanol (5.2), 5.0 mL of p-dimethylaminobenzene. Formaldehyde solution (5.6), shake well and dilute to the mark with sulfuric acid solution (5.5). Place for 40 min. Suction at 470nm with 2 cm Take the pool, use distilled water as the reference solution, measure the absorbance of the solution, subtract the absorbance of the reagent blank, and use the calibration curve to linearize The slope of the regression equation was calculated to obtain the corresponding methyl hydrazine content (μg). 8.2.2 Determination method for the presence of nitrite in water Pipette 15 mL of water sample into a 25 mL colorimetric tube and add 0.2 mL of ammonium sulfamate solution (5.7). The remaining steps are as shown in 8.2.2. get on. In the 25 mL constant volume, if the total amount of NO2 exceeds 20 μg, two spike recovery experiments should be performed simultaneously. The results of the measurements are corrected using the average recovery. The relative deviation between the spiked and recovered parallel samples should not exceed 10%. Note. The standard addition procedure is as follows. Add 3.0 mL of methyl hydrazine standard solution (5.10), 0.2 mL amino group to a 25 mL colorimetric tube containing 15 mL of water. Ammonium sulfonate solution (5.7), the remaining steps are carried out according to 8.2.1. 8.2.3 Determination method for the presence of dimethyl hydrazine in water When the content of dimethyl hydrazine in water is higher than that of methyl hydrazine, it should be determined by dimethyl hydrazine (see GB/T 14376). The content of dimethyl hydrazine was measured. Make a calibration curve for the dimethyl hydrazine according to 8.1.1 or 8.1.2 and find the dimethyl group on the curve. The 肼 content corresponds to the absorbance A1. Operate according to 8.2.1 or 8.2.2 and record the absorbance A2. Take A3=A2-A1 and use A3 value at school The methyl hydrazine content in the water sample was calculated by using the quasi-curve or using the regression equation.

9 Calculation of results

9.1 Calculation of results The methyl hydrazine content ρ (mg/L) in the sample is calculated by the following formula. ρ = Vb AAk × −× )( 0 Where. A - absorbance of the sample solution; A0 - reagent blank liquid absorbance; b -- the slope of the calibration curve obtained by linear regression analysis; V - the volume of the sample taken during the analysis; k -- dilution factor (according to sample type, see table below). Example of k value Sample volume taken during sample type analysis (mL) k Remarks Surface water or groundwater 15 1 §7.3.2 Industrial wastewater 2~15 2 §7.3.1 9.2 Results representation When the result is greater than or equal to 0.100 mg/L, the calculation results take 3 significant figures; when the result is less than 0.100 mg/L, Leave to the third digit after the decimal point. 10 Precision and accuracy 10.1 Precision Six laboratories tested uniform water samples with methyl hydrazine concentrations of 0.043 mg/L, 0.103 mg/L, and 0.396 mg/L. The relative standard deviations in the experimental room were 2.0-6.6 (%), 0.5-8.7 (%), 0.2-2.8 (%), respectively; The quasi-bias were 10.2%, 7.6%, and 4.2%, respectively. The repeatability limits were 0.0049 mg/L, 0.012 mg/L, and 0.021 mg/L, respectively. again The current limits were 0.013 mg/L, 0.025 mg/L, and 0.050 mg/L, respectively. 10.2 Accuracy 6 laboratories added surface water of 0.040 mg/L and 0.100 mg/L, and industrial wastewater plus 0.100 mg/L and 0.400 Four samples of mg/L were measured, and the recoveries were 97.1±7.2 (%); 99.2±4.0 (%); 102.2±6.8 (%); 102.8 ± 6.0 (%). 11 Quality Assurance and Quality Control 11.1 The sensitivity of this method decreases with increasing temperature. The determination of the methyl hydrazine content of the water sample should be carried out simultaneously with the calibration curve. 11.2 The experimental temperature range of this method is (15~30) oC. 11.3 There must be a full ...

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