GB/T 8570.4-1988 Determination of residual content of liquid anhydrous ammonia - Volumetric method

This standard specifies the volumetric determination method for the residual content of liquid anhydrous ammonia. GB/T 8570.4-1988 Determination of the residual content of liquid anhydrous ammonia Volumetric method GB/T8570.4-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Liquid anhydrous ammonia
Determination of residue content--Titrimetric method
Liquefied anhydrous ammonia- Determination of residue content--Titrimetric method This standard specifies the volumetric determination method of the residue content of liquid anhydrous ammonia (liquid ammonia). 1 Reference Standard
GB601 Preparation Method of Standard Solution of Chemical Reagent 2 Principle
UDC 661.518
GB 8570.4--88
Replace GB536-65
After evaporating the liquid ammonia sample at room temperature, read the volume of the evaporation residue, and in the presence of an indicator, titrate the ammonia in the evaporation residue with a standard sulfuric acid solution, and calculate according to the prescribed formula to obtain the residue content. 3 Reagents and Solutions
In the analysis, unless otherwise specified by phenanthrene, only analytical reagents, distilled water or water of equivalent purity can be used. 3.1 Sulfuric acid (GB625-77): c (1/2H2SO) = 0.1, 1 mol/L (equivalent to 0.1, 1N respectively) standard solution, prepared and calibrated according to GB601.
3.2 Methyl red (HG3-985--76): 1g/L 95% (V/V) ethanol solution. 4 Instruments
Usually laboratory instruments and:
4.1 Lysenko receptor (see figure): total volume not less than 500ml, upper division 10ml, lower capillary volume 1.00ml, minimum division 0.05ml.
sto an
典5 Inner diameter
Lysenko receptor diagram
Ministry of Chemical Industry of the People's Republic of China approved on 1987-12-02 132
Beijing capital to exempt
1988-09-D1 implementationWww.bzxZ.net
5 Operating procedures
GB 8570.4—88
5.1 Collection of samples
Carefully open the liquid valve on the liquid ammonia cylinder or storage tank, or the pressure reducing valve on the sampling tube of the tank truck, first release some liquid ammonia and discard it, then use the Lysenko receptor (4.1) to collect 200ml of sample at a sampling rate of 100ml/min. When sampling, prevent condensed water from contaminating the sample.
Note: If the liquid phase valve of the liquid ammonia container is not suitable for sampling the Lysenko receptor, a threaded joint can be used to match a 5mm inner diameter stainless steel tube and a needle valve with a pressure resistance of 3MPa, and then the sample can be taken in the same way. 5.2 Determination
Put a rubber stopper with a hole on the mouth of the Lysenko receptor (4.1) after sampling, and let the ammonia evaporate slowly at room temperature until the ammonia gas escapes from the upper part of the receptor and the bottom capillary contains an evaporation residue composed of ammonia water, oil and other non-volatile substances at room temperature. Record the volume of the evaporation residue.
After diluting the evaporation residue with an appropriate amount of water, transfer it to a 250ml beaker, continue to wash the Lysenko receptor with water several times until the washing liquid is neutralized, combine the washing liquid into a beaker, add 2 drops of methyl red solution (3.2), stir well, and titrate with a standard sulfuric acid solution with c (1/2H2SO) = 0.1mol/L until the solution changes from yellow to slightly red. 6 Result Expression
6.1 The residue content X expressed as mass percentage is calculated as follows: X = 0.73V1 - 0.001 7V2
-The volume of the evaporation residue in the Lysenko receiver, ml, V
V2---The volume of the sulfuric acid standard solution with c (1/2HzSO.) = 0.1mol/L used for titration, ml, the coefficient derived from the formula.
0.73 and 0.0017--
Note: ① When titrating with c (1/2H,SO,) = 1mo1/L sulfuric acid standard solution, the coefficient 0.0017 is changed to 0.017. ② If the concentration of the sulfuric acid standard solution used is not exactly the same as that specified in this standard, it should be corrected accordingly. 6.2 Allowable Error
6.2.1 The arithmetic mean of the results of two parallel determinations is taken as the determination result. 6.2.2 Absolute allowable difference of parallel determination results: Residue content, %
Additional instructions,
Absolute allowable difference, %
This standard is under the jurisdiction of Shanghai Research Institute of Chemical Industry, Ministry of Chemical Industry. This standard was drafted by Shanghai Research Institute of Chemical Industry, Ministry of Chemical Industry and Wujing Chemical Plant. The main drafters of this standard are Yin Yongkang, Jin Zhigen, Yao Bingsheng, Liu Miaode and Zhang Wenwei. 133
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