GB/T 17141-1997 PDF EnglishUS$80.00 · In stock · Download in 9 seconds
GB/T 17141-1997: Soil quality. Determination of lead, cadmium. Graphite furnace atomic absorption spectrophotometry Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure
Similar standardsGB/T 17141-1997: Soil quality. Determination of lead, cadmium. Graphite furnace atomic absorption spectrophotometry---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT17141-1997 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 13.080 Z 18 Soil quality - Determination of lead, cadmium – Graphite furnace atomic absorption spectrophotometry Issued on. DECEMBER 8, 1997 Implemented on. MAY 1, 1998 Issued by. Ministry of Environmental Protection of the People’s Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China. Table of Contents1 Subject content and scope of application... 3 2 Principle... 3 3 Reagents... 3 4 Instruments... 4 5 Samples... 5 6 Analysis procedures... 5 7 Result representation... 7 8 Precision and accuracy... 7 Annex A (Normative) Determination of the water content in soil sample... 8 Additional information... 9 Soil quality - Determination of lead, cadmium – Graphite furnace atomic absorption spectrophotometry1 Subject content and scope of application1.1 This Standard specifies the graphite furnace atomic absorption spectrophotometry for determining the lead and cadmium in the soil. 1.2 The detection limit (calculated by digesting 0.5g of test piece to the constant volume of 50mL) of this Standard is as follows. 0.1 mg/kg, for both lead and cadmium. 1.3 USE the Zeeman method, self-absorption method and deuterium lamp method to deduct the background. In the presence of a matrix modifier such as diammonium hydrogen phosphate or ammonium chloride, directly DETERMINE the trace lead and cadmium in test solution. There is no interference.2 PrincipleUSE the hydrochloric acid - nitric acid - hydrofluoric acid - perchloric acid full digestion method to completely destroy the mineral lattices in soil so that all the elements to be tested in the test pieces can enter into the test solution. INJECT the test solution into a graphite furnace afterwards. EVAPORATE and REMOVE the coexisting matrix components by a predetermined temperature rising program such as drying, ashing and atomization.3 ReagentsUnless otherwise specified, the analytical reagents and deionized water or water of equivalent purity, complying with national standards, are used as reagents in this Standard. 3.1 Hydrochloric acid (HCl), ρ = 1.19 g/mL, guaranteed reagent. 3.2 Nitric acid (HNO3), ρ = 1.42 g/mL, guaranteed reagent. 3.6 Perchloric acid (HClO4), ρ = 1.68 g/mL, guaranteed reagent. 3.7 Aqueous solution of diammonium hydrogen phosphate [(NH4)2HPO4] (guaranteed reagent), with a weight fraction of 5%. 3.8 Standard lead stock solution, 0.500 mg/mL. Accurately WEIGH 0.5000g (ACCURATE to 0.0002g) of spectral pure metallic lead. PUT it in a 50mL beaker. ADD 20mL of nitric acid solution (3.3). Slightly HEAT the solution for dissolution. After cooling, TRANSFER the solution into a 1,000mL volumetric flask. ADD water to the scale. SHAKE evenly. 3.9 Standard cadmium stock solution, 0.500 mg/mL. Accurately WEIGH 0.5000g (ACCURATE to 0.0002g) of spectral pure metallic cadmium particles. PUT them in a 50mL beaker. 3.10 Standard lead and cadmium working mixture, where lead is 250 μg/L and cadmium is 50 μg/L. Before use, USE nitric acid solution (3.4) to dilute and prepare the standard lead and cadmium stock solution (3.8) (3.9) step by step.4 Instruments4.1 General laboratory instruments and the following instruments. 4.2 Graphite furnace atomic absorption spectrophotometer (with background subtraction device). 4.3 Lead hollow cathode lamp. 4.4 Cadmium hollow cathode lamp. 4.7 Instrument parameters The optimal testing conditions for different types of instruments are different. It is allowed to select by yourselves according to the instrument instruction manual. For the measurement conditions generally adopted in this Standard, SEE Table 1.5 SamplesEvenly MIX the soil samples (generally not less than 500g) taken. USE the quartering method to divide the samples to 100g or so. CONDUCT air drying (natural air drying or freeze drying) to the divided soil samples. REMOVE the foreign matters in the soil, such as stones, animal and plant residues, etc. USE a wooden stick (or an agate pestle) for milling.6 Analysis procedures6.1 Test solution preparation Accurately WEIGH 0.1g to 0.3g (ACCURATE to 0.0002g) of test pieces. PUT them in a 50mL teflon crucible. After wetting by using water, ADD 5mL of hydrochloric acid (3.1). HEAT the test pieces on an electric hot plate in a fume cupboard at low temperature for preliminary decomposition. 6.2 Determination ADJUST the instrument to optimal operating conditions according to the instrument instruction manual. DETERMINE the absorbance of the test solution afterwards. 6.3 Blank test USE water to replace the test pieces. USE the same procedures and reagents as Section (6.1). PREPARE the whole process blank solution. DETERMINE in accordance with the procedure (6.2). PREPARE at least two portions of blank solution in each batch of samples. 6.4 Calibration curve Respectively TRANSFER 0.00mL, 0.50mL, 1.00mL, 2.00mL, 3.00mL and 5.00mL of standard lead and cadmium working mixture (3.10) into a 25mL volumetric flask. ADD 3.0mL of aqueous diammonium hydrogen phosphate solution (3.7) afterwards.7 Result representationThe lead and cadmium contents W [Pb (Cd), mg/kg] in soil sample shall be calculated according to the following equation.8 Precision and accuracyMany laboratories use this method to analyze the precision and accuracy of the lead and cadmium in the ESS series of soil samples. SEE Table 2.Annex A(Normative) Determination of the water content in soil sample A.1 WEIGH 5g to 10g (ACCURATE to 0.01g) of air-dried soil sample passing through an 100 mesh sieve. PLACE the soil sample in an aluminum box or weighing bottle. DRY in a drying oven at 105°C for 4h to 5h, until the soil sample comes up to constant weight. A.2 The water content in air-dried soil sample f expressed as percentage shall be calculated according to the following equation. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 17141-1997 be delivered?Answer: The full copy PDF of English version of GB/T 17141-1997 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 17141-1997_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 17141-1997_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 17141-1997 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.How to buy and download a true PDF of English version of GB/T 17141-1997?A step-by-step guide to download PDF of GB/T 17141-1997_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 17141-1997". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
