my country's environmental sanitation industry started late, and there is a blank in the monitoring method of lead in urban domestic waste. Generally, the monitoring method of soil is used for reference. However, the composition and characteristics of soil and domestic waste are different. In order to standardize the monitoring method of lead in urban domestic waste, this standard is specially formulated. This standard is formulated with reference to the determination method of total lead in GB 15618-1995 soil environmental quality standard. This standard specifies the principle, instrument reagents and operating procedures for the determination of lead content by atomic absorption spectrophotometry. This standard is applicable to the determination of lead in urban domestic waste. CJ/T 101-1999 Determination of lead in urban domestic waste by atomic absorption spectrophotometry CJ/T101-1999 Standard download decompression password: www.bzxz.net

CJ/T101-1999
Municipal domestic refuse
Determination of lead
Atomic absorption spectrophotometric method
Municipal domestic refuse--Determination of leadAtomic absorption spectrophotometric methodPublished on 11-24-1999
Published by the Ministry of Construction of the People's Republic of China
Implemented on 2000-06-01
CJ/T101-1999
my country's sanitation industry started late, and the monitoring method for lead in municipal domestic refuse is a blank in China. The monitoring method of soil is generally used for reference, but the composition and characteristics of soil and domestic refuse are different. In order to standardize and standardize the monitoring method for lead in municipal domestic refuse, this standard is specially formulated.
This standard is formulated with reference to the determination method of total lead in GB15618-1995 "Soil Environmental Quality Standard". This standard is proposed by the Standard and Quota Research Institute of the Ministry of Construction. This standard is under the jurisdiction of Shanghai Municipal Environmental Sanitation Administration, the technical unit of urban environmental sanitation standards of the Ministry of Construction. This standard was drafted by Tianjin Environmental Sanitation Engineering Design Institute. The main drafters of this standard are Chen Xiaoping and Zhang Fan. This standard is entrusted to Tianjin Environmental Sanitation Engineering Design Institute for interpretation. 1 Scope
Urban Construction Industry Standard of the People's Republic of China Municipal Domestic Refuse
Determination of lead
Atomic absorption spectrophotometric method
Municipal domestic refuse--Determination of leadAtomic absorption spectrophotometric methodCJ/T101--1999
This standard specifies the principle, instrument, reagent and operation steps for the determination of lead content by atomic absorption spectrophotometry. This standard is applicable to the determination of lead in municipal domestic refuse. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. CJ/T3039—1995 Sampling and physical analysis methods for urban domestic waste 3 Collection and preparation of samples
The collection and preparation of urban domestic waste samples, the determination of moisture content and the preservation of samples shall be carried out in accordance with the provisions of CJ/T3039. 4 Principle
After the sample is digested with nitric acid and perchloric acid, the lead in the digestion solution is extracted and enriched by the hydrochloric acid-potassium iodide-methyl isobutyl ketone system, the lead absorbance is determined by air-acetylene flame atomic absorption spectrometry, and the standard curve method is used for quantification. 5 Reagents
Unless otherwise specified, the reagents used in this standard are analytically pure reagents that meet national standards, and the water used is deionized water. 5.1 Nitric acid (HNO), p=1.40g/mL. 5.2 Perchloric acid (HCIO,), p=1.68g/mL. 5.3 Nitric acid solution, 1+1 (V/V).
5.4 Hydrochloric acid solution, 1+1 (V/V).
5.52% nitric acid solution (V/V).
5.61% hydrochloric acid solution (V/V).
5.710% ascorbic acid (m/V).
5.816.6% potassium iodide aqueous solution (m/V). 5.9 Lead standard stock solution: Accurately weigh 0.1000g of spectrally pure lead reagent, slightly heat with 5mL nitric acid solution (5.3) until completely dissolved, transfer to a 1000mL volumetric flask, and dilute with water to the mark. The lead concentration of this solution is 100μg/mL. 5.10 Lead standard working solution: Pipette 5.00mL of lead standard stock solution (5.9) into a 100mL volumetric flask and dilute to volume with 1% hydrochloric acid solution. Approved by the Ministry of Construction of the People's Republic of China on November 24, 1999 and implemented on June 1, 2000
The lead concentration of this solution is 5μg/mL.
5.11 Methyl isobutyl ketone (MIBK).
6 Instruments
CJ/T101~1999
a) Atomic absorption spectrophotometer (with background correction device and accessories). b) Lead element lamp.
Working parameters: Flame type air-acetylene gas (lean flame, blue); wavelength 283.3nm;
Lifting volume 2~3L/min;
Gas flow air: 3.25L/min; acetylene gas: 0.70L/min. 7 Operation steps
7.1 Drawing of standard curve
Pipette 0.00, 2.00, 4.00, 6.00, 8.00mL of lead standard solution (5.10) into 50mL colorimetric tubes and dilute to 25mL with 1% hydrochloric acid solution. The lead concentration of this solution is 0.00, 10.00, 20.00, 30.00, 40.00 μg, then add 5 mL potassium iodide solution (5.8), 2 mL ascorbic acid solution (5.7), accurately add 5.00 mL methyl isobutyl ketone solution (5.11), extract for 2 minutes and let stand for stratification. Take the upper organic phase and use atomic absorption spectrophotometry flame method to determine the lead. 7.2 Determination of sample
Weigh 2.0 g of sample, accurate to 0.0001 g, put it in a 250 mL conical flask, add a little distilled water to moisten the sample, add 10 mL of concentrated nitric acid, cover it with a small funnel, and digest it on a hot plate at low temperature (120°C) until it is almost dry. Remove it and cool it down, then add 5 mL of perchloric acid (depending on the amount of organic matter in the sample), and continue digesting until the white smoke is almost gone and the residue becomes grayish white and almost dry. Remove the conical flask and cool it. Add 1mL (1+1) hydrochloric acid. After dissolving, transfer the solution to a 50mL volumetric flask and make up to volume. Prepare two blank samples at the same time. After the solution is clarified, take 25.00mL of the supernatant into a 50mL volumetric flask. The following steps are the same as (7.1). 8. Expression of analysis results
The lead content c (mg/kg) is calculated as follows: C
Where: m--the amount of lead in the sample found on the standard curve, ug; 2--the multiple of sampling;
m sample-the sample weight, g.
The result should be expressed to four decimal places.
9 Precision and AccuracybzxZ.net
The relative standard deviation of lead in five batches of samples measured in the laboratory is 2.9%, and the recovery rate of spiked samples is 95% to 102%. The People's Republic of China Urban Construction
Industry Standard
Urban Domestic Waste
Determination of Lead
Atomic Absorption Spectrophotometry
CJ/T101-1999
Published by China Standards Press
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Format: 880×12301/16
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Word count: 4,000
First edition: May 2000
First printing: May 2000
Print run: 1-1800
Book number: 155066·2-12908
Price: 6.00 yuan
Heading: 407-25
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