JIS-Z-3920-1991-ENG.pdf
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1、i i .; , e b e , J I S Z*3920 91 4933b08 O533239 T7T IS UDC 621.791 :628.511.122:543 JAPANESE INDUSTRIAL STANDARD Methods for chemical analysis of elements in welding fumes JIS Z 3 9 2 0 - 1 9 9 1 Translated and Published bY Japanese Standards Association Printed in Japan 11 s Copyright Japanese Sta
2、ndards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/16/2007 00:35:36 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Z*3920 93 4933608 0533240 791 In the event of any doubt arising, the origi
3、nal Standard in Japanese is to be final authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/16/2007 00:35:36 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Z
4、U3920 91 4933608 0513241 628 a P a a a UM: 621.791:628.511.122:543 JAPANESE INDUSTRIAL STANDARD J I S Methods for chemical analysis of elements in welding fumes Z 3920-1991 1 . Scope This Japanese Industrial Standard specifies the methods for analysis of the chemical composition contained in the fum
5、es generated from welding and brazing floating in the air in welding environment. Applicable Standards are as follows: JIS K 0050 JIS K 0115 Remarks: General rules for chemical analysis General rules for molecular absorptiometric analysis General rules for atomic absorption spectrochemical analysis
6、Standard substances for volumetric analysis JIS K 0121 JIS K 8005 JIS Z 3950 Methods of measurement for weld fume concentration JIS Z 8401 Rules for rounding off of numerical values 2. Composition to be analyzed The composition of fumes generated from welding, thermal cutting and brazing to be analy
7、zed shall be as follows: (1) Fume from welding Manganese, copper, nickel, chromium, vanadium, cobalt, lead, zinc, molybdenum, iron, aluminium and fluorine. (2) Fume from brazing Silver, copper, zinc, cadmium, phosphorus and fluorine. 3. General matters The general matters common to chemical analysis
8、 shall comply with JIS K 0050, JIS K 0115 and JIS K 0121. 4. Sampling and handling of samples for analysis The sampling and handling of samples for analysis shall be as follows: Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Win
9、g, Bernie Not for Resale, 03/16/2007 00:35:36 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S ZX3920 93 4933608 0533242 564 2 Z 3920-1991 The sampling of samples for analysis shall be done by the measuring method for total dust mass concentration measuring method as s
10、pecified in 4.2 (measuring method for mass concentration of total dust) of JIS Z 3950. However, filter papers used for the filtering and collecting equipments shall be called filtering materials, and they are low hygroscopic and having a collecting efficiency of not less than 95 % for the particles
11、of 0 . 3 um diameters. And, as a rule, glass fiber filter papers are used for them. The weighing out of samples for analysis shall be done as quickly as possible, to avoid absorption of moisture and mixture of foreign matters. The samples for analysis shall be weighed out by using a chemical balance
12、 and reading to the figure of 0 . 1 mg. 5. Notes on analyzing operation In performing analysis, blank tests shall be made through whole the operations, and the measured values shall be corrected accordingly. 6. Rounding off of analysis values The analysis values shall be expressed in percentages whi
13、ch shall, as a rule, be calculated to three significant figures and rounded off to two figures in accordance with JIS Z 8401. 7 . Methods for chemical analvsis of weld fumes 7 . 1 Classification of methods for chemical analysis The classification of methods for chemical analysis shall be as follows:
14、 (1) Atomic absorption spectrometry This method is used for determination of manganese, copper, nickel, chromium, vanadium, cobalt, lead, zinc, molybdenum, iron and aluminum. (2) Sulphosalicylic acid extraction absorptiometry This method is used for the determination of iron in the sample of iron co
15、ntent 10 wt% or more. (3) Thermal hydrolysis separation - Lanthanum alizarin complexon absorptiometry fluorine. This method is used for the determination of 7 . 2 Atmomic absorption spectrometry 7 . 2 . 1 Summary Put the sample into a platinum crucible together with the filter, decompose it by addin
16、g nitric acid, perchloric acid and hydro- fluoric acid, and concentrate by heating until white smoke arises. hydrochloric acid to it to dissolve salts, and spray into the air-acetylene flame or nitrous oxide-acetylene flame of the atomic absorption spectrometer, and measure the absorbance of it. Add
17、 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/16/2007 00:35:36 MDTNo reproduction or networking permitted without license from IHS -,-,- (7) (11) 3 Z 3920-1991 Reagents Hydrochloric acid (l+l) R
18、eagents shall be as follows: Nitric acid Perchloric acid Hydrofluoric acid Standard manganese solution (100 ugMn/ml) Weigh out 0 . 1 0 0 g of manganese (not less than 99.9 wt%), decompose it by adding 10 ml of hydrochloric acid (l+l) and heating it, after cooling to the normal temperature, transfer
19、it with water into a 1000 ml volumetric flask and dilute it with water up to the mark line. Standard copper solution (100 UgCulml) Weigh out 0 . 1 0 0 g of copper (not less than 99.96 wt%), decompose it by adding 1 0 ml of nitric acid (l+l) and heating it, after cooling to the normal temperature, tr
20、ansfer it with water into a 1000 ml volumetric flask and dilute it with water up to the mark line. Standard nickel solution (100 LIgNi/ml) Weigh out 0 . 1 0 0 g of nickel (not less than 99.95 wt%), decompose it by adding 10 ml of nitric acid (1+1) and heating it, after cooling to the normal temperat
21、ure, transfer it with water into a 1000 ml volumetric flask and dilute it with water up to the mark line. Standard chromium solution (100 ugCr/ml) Weigh out 0 . 1 0 0 g of chromium (not less than 99.9 wt%), decompose it by adding 10 ml of hydrochloric acid (l+l) and heating it, after cooling to the
22、normal temperature, transfer it with water into a 1000 ml volumetric flask and dilute it with water up to the mark line. Standard vanadium solution (100 ugV/ml) vanadium (not less than 99.9 wt%), decompose it by adding 10 ml of aqua regia (hydrochloric acid 3 + nitric acid i ) and heating it, and ev
23、aporate it to almost dryness. 10 ml of hydrochloric acid (l+i) to this and heating it, after cooling to the normal temperature, transfer it with water into a 1000 ml volumetric flask and dilute it with water up to the mark line. Weigh out 0 . 1 0 0 g of Dissolve salts by adding Standard cobalt solut
24、ion (100 I.igCo/ml) Weigh out 0 . 1 0 0 g of cobalt (not less than 99.9 wt%), decompose it by adding 10 ml of nitric acid (l+l) and heating it, after cooling to the normal temperature, transfer it with water into a 1000 ml volumetric flask and dilute it with water up to the mark line. Standard lead
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