YS/T 271.1-1994 PDF English
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Methods for chemical analysis of xanthates. The lead-acetate titration method for determination of xanthate content
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YS/T 271.1-1994: Methods for chemical analysis of xanthates. The lead-acetate titration method for determination of xanthate content
---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/YST271.1-1994
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC 622.765.06.543.06
YS/T 271.1-1994
Renamed from GB 8150.1-87
Methods for chemical analysis of xanthates –
The lead-acetate titration method
for determination of xanthate content
APPROVED ON. JANUARY 27, 1987
Implemented on. JUNE 01, 1988
Issued by. China Non-ferrous Metal Corporation
Table of Contents
1 Method summary... 3
2 Reagents... 3
3 Analytical procedures... 5
4 Calculation of analytical results... 6
5 Allowable difference... 6
Additional information... 7
Methods for chemical analysis of xanthates –
The lead-acetate titration method
for determination of xanthate content
This standard complies with GB 1467-78 “Method for chemical analysis of
metallurgy product - General rules and regulations”.
This method is applicable to the determination of the amount of xanthogen in
ethyl, isopropyl, n-butyl, isobutyl, n-pentyl, isopentyl and other sodium xanthate
or potassium xanthate of lower carbon alkyl group.
1 Method summary
The sodium nitro-ferrocyanide is used as an indicator, the potassium
ferricyanide is used to oxidize impurities such as alkali metal sulfides in
xanthate into monomer sulfur to eliminate interferences. The chemical reaction
is.
Then the sodium rhodizonic acid is used as an indicator, and the lead acetate
standard solution is used to titrate the sodium xanthate. The chemical reaction
formula is.
2 Reagents
2.1 Hydrochloric acid (specific gravity 1.19).
2.2 Hydrochloric acid (6N).
2.3 Glacial acetic acid.
2.4 Aqueous ammonia solution (10%).
2.5 Ammonium-ammonium chloride buffer solution. Prepared in accordance
with clause 38 (1) of GB 603-77 “Chemical reagent - Preparations of reagent
solutions for use in test methods”.
2.6 Hexamethylenetetramine-hydrochloric acid buffer solution. DISSOLVE 300
g of hexamethylenetetramine in 500 ml of water, ADD 30 ml of hydrochloric acid
(2.1), ADD water to dilute it to 1000 ml.
2.7 Potassium ferricyanide solution (1%). STORE it in a brown bottle,
PREPARE it before use.
2.8 Chrome black T indicator solution (0.5%). WEIGH 0.5 g of chrome black T
and 2 g of hydroxylamine hydrochloride, DISSOLVE it in 100 ml of ethanol.
PREPARE it before use.
2.9 Xylenol orange indicator solution (0.2%).
2.10 Sodium nitro-ferrocyanide indicator solution (2%). PREPARE it before use.
2.11 Sodium rhodizonic acid indicator solution (0.1%). PREPARE it before use.
2.16.3 The equivalent concentration N of lead acetate standard solution is
calculated as follows.
3 Analytical procedures
3.1 Distilled or deionized water for analysis. USE sodium hydroxide solution to
adjust it to pH 6~7.
3.2 The xanthate specimen storage conditions are moisture and heat resistant,
and the bottle caps are tightly closed. MINIMIZE uncovering time when
analyzing.
3.3 USE the weighing bottle with lid to weigh 10.000 g of specimen, USE water
to transfer it into a 500 ml volumetric flask, DILUTE it to the mark, SHAKE it
uniformly, accurately TAKE 5.00 ml into a 250ml beaker. ADD 2 drops of sodium
nitro-ferrocyanide indicator solution (2.10).
4 Calculation of analytical results
CALCULATE the percentage of xanthogenate by the following formula.
Xanthogenate content (%) = (N • V • M/1000) / (5W/500) x 100
5 Allowable difference
The allowable difference of the parallel determination in this method is not more
than 0.5%.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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