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GB/T 4698.25-2017: Methods for chemical analysis of titanium sponge, titanium and titanium alloys -- Part 25: Determination of chlorine content -- Silver chlorin spectrophotometry Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 4698.25: Historical versions
Similar standardsGB/T 4698.25-2017: Methods for chemical analysis of titanium sponge, titanium and titanium alloys -- Part 25: Determination of chlorine content -- Silver chlorin 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/GBT4698.25-2017 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.120.50 H 14 Replacing GB/T 4698.25-1996 Methods for chemical analysis of titanium sponge, titanium and titanium alloys - Part 25.Determination of chlorine content - Silver chlorin spectrophotometry Issued on: SEPTEMBER 29, 2017 Implemented on: APRIL 01, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of PRC; National Standardization Administration. Table of ContentsForeword... 3 1 Scope... 6 2 Method summary... 6 3 Reagents... 6 4 Instrumentation... 7 5 Specimen... 7 6 Analytical procedure... 7 7 Calculation and expression of analytical results... 8 8 Precision... 8 9 Test report... 9ForewordGB/T 4698 "Methods for chemical analysis of titanium sponge, titanium and titanium alloys" is divided into the following parts. - Part 1.Determination of copper content - Flame atomic absorption spectrometry; - Part 2.Determination of iron content; - Part 3.Determination of silicon content - Molybdenum blue spectrophotometry; - Part 4.Determination of manganese content - Potassium periodate spectrophotometry and inductively coupled plasma atomic emission spectrometry; - Part 5.Determination of molybdenum content - Thiocyanate spectrophotometry and inductively coupled plasma atomic emission spectrometry; - Part 6.Determination of boron content - Methylene blue spectrophotometry and inductively coupled plasma atomic emission spectrometry; - Part 7.Determination of oxygen and nitrogen content; - Part 8.Determination of aluminum content - Separation with sodium hydroxide- EDTA complex-metric titration and inductively coupled plasma atomic emission spectrometry; - Part 9.Determination of tin content - Potassium iodate titration and inductively coupled plasma atomic emission spectrometry; - Part 10.Determination of chromium content - Ammonium ferrous sulfate titration and inductively coupled plasma atomic emission spectrometry (with vanadium); - Part 11.Determination of chromium content in the absence of vanadium- ammonium ferrous sulfate titration method; - Part 12.Determination of vanadium content - Ammonium ferrous sulfate titration and inductively coupled plasma atomic emission spectrometry; - Part 13.Determination of zirconium content - EDTA complexometric titration and inductively coupled plasma atomic emission spectrometry; - Part 14.Determination of carbon content; - Part 15.Determination of hydrogen content; - Part 17.Determination of magnesium content - Flame atomic absorption spectrometry; Methods for chemical analysis of titanium sponge, titanium and titanium alloys - Part 25.Determination of chlorine content - Silver chlorin spectrophotometry1 ScopeThis Part of GB/T 4698 specifies the method for the determination of chlorine content in titanium sponge, titanium, titanium alloys. This Part applies to the determination of chlorine content in titanium sponge, titanium, titanium alloys. Determination range. 0.010% ~ 0.40%.2 Method summaryThe sample is dissolved in hydrofluoric acid; fluoride ions are complexed with saturated boric acid; titanium is oxidized with nitric acid. In the presence of acetone, chlorine reacts with silver nitrate to form a silver chloride suspension, the absorbance of which is measured spectrophotometrically at a wavelength of 420 nm.3 ReagentsUnless otherwise specified, only reagents of confirmed analytical grade and laboratory grade II water are used in the analysis. 3.1 Hydrofluoric acid (1 + 4), extra-pure. 3.2 Saturated boric acid solution. 3.3 Nitric acid (1 + 1). 3.4 Acetone. 3.5 Silver nitrate solution (10 g/L). 3.6 Chlorine standard stock solution. Weigh 1.6485 g of standard sodium chloride (preliminarily calcined at 400 °C ~ 500 °C to constant mass and cooled to room temperature in a desiccator); dissolve it in water; transfer it to a 1000 mL volumetric flask; use water to dilute to the mark; mix thoroughly. 1 mL of this solution contains 1 mg of chlorine. 3.7 Chlorine standard solution. Pipette 10.00 mL of the chlorine standard stock solution (3.6) into a 100 mL volumetric flask; use water to dilute to the mark; mix thoroughly. 1 mL of this solution contains 100 μg of chlorine.4 InstrumentationSpectrophotometer.5 SpecimenPerform the specimen preparation procedures established for titanium sponge, titanium, titanium alloys.6 Analytical procedure6.1 Sample Weigh 0.50 g of sample, accurate to 0.0001 g. 6.2 Number of determinations Perform two independent determinations; calculate the average value. 6.3 Blank test Perform a blank test with the sample. 6.4 Determination 6.4.1 Place the sample (6.1) in a 250 mL polyethylene cup (with lid); add 10 mL of hydrofluoric acid (3.1) to dissolve at room temperature. 6.4.2 After the sample is completely dissolved, add 40 mL of saturated boric acid solution (3.2); mix well; cool it. Transfer to a 100 mL volumetric flask; use water to dilute to the mark; mix well. 6.4.3 Transfer the solution according to Table 1 to a 50 mL brown volumetric flask; add 5 mL of nitric acid (3.3); mix well; allow to stand until the solution becomes clear. Add 1.0 mL of acetone (3.4) and mix well. Add 1.0 mL of silver nitrate solution (3.5); mix well; use water to dilute to the mark; mix well. ......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 4698.25-2017 be delivered?Answer: The full copy PDF of English version of GB/T 4698.25-2017 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 4698.25-2017_English with my colleagues?Answer: Yes. 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