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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 209-2006 Sodium hydroxide for industrial use, and the following main technical changes have been made with respect to GB/T 209-2006.
——Some normative references are modified (see Clause 2; Clause 2 of Edition 2006);
——The model and specification expression methods of sodium hydroxide for industrial use is adjusted: expressed as IS-IT-I, IS-IT-II, IL-IT-I and IL-IT-II (Clause 3 and Clause 4 of the Edition 2006) in Edition 2006, and expressed as IS-I, IS-II, IL-I, IL-II and IL-III (see Table 1 of Clause 4) in this Edition;
——50% specification IL-I and technical requirements are added (see Table 1 in Clause 4);
——The models, specifications and technical requirements of IS-DT-I, IS-DT-II, IS-CT-I, IL-DT-I, IL-DT-II and IL-CT-I are deleted (see Clause 4 of Edition 2006);
——The product classification of "superior products, first-grade products and qualified products" is deleted (see Clause 4 of Edition 2006);
——Some technical indexes are modified (see Table 1 in Clause 4, 4.3 in Edition 2006);
——The method for determination of sodium hydroxide content is added (see 6.2);
——The product models referenced by the conversion proportion of quality indexes for products of other specifications are deleted (4.4, 4.5 and 4.6 of Edition 2006);
——The content of self-sealing bag for sodium hydroxide sampling is added (see 5.2 and 5.3);
——The judgment of product model and specification is deleted (see 7.2 of Edition 2006);
——The inspection item contents of IS-DT, IS-CT, IL-DT and IL-CT models and specifications in the inspection rules are deleted (see 7.3 of Edition 2006);
——The user acceptance regulations are deleted (see 7.5 of Edition 2006);
——The security content is deleted (see Clause 9 of the Edition 2006);
——The potentiometric titration method for determining the content of sodium chloride in sodium hydroxide is added (see Annex A).
This standard was proposed by the China Petroleum and Chemical Industry Association.
This standard is under the jurisdiction of the National Standardization Technical Committee Chlor-alkali Chemical Branch (SAC/TC 63/SC 6).
This standard was first issued in 1963, revised for the first time in 1984, revised for the second time in 1993 and revised for the third time in 2006.
Sodium hydroxide for industrial use
Warning——The process of production, transportation, loading and unloading, storage, transportation and use of products specified in this standard may be hazardous if appropriate precautions are not observed. This standard does not purport to address all of the safety concerns, if any, associated with the product. It is the responsibility of the users of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
1 Scope
This standard specifies the requirements, sampling, test methods, inspection rules, marking, packaging, transportation and storage of sodium hydroxide for industrial use.
This standard is applicable to products of sodium hydroxide for industrial use.
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 190 Packing symbol of dangerous goods
GB/T 191 Packaging—Pictorial marking for handling of goods
GB/T 601 Chemical reagent—Preparations of reference titration solutions
GB/T 603 Chemical reagent—Preparations of reagent solutions for use in test methods
GB/T 4348.1 Sodium hydroxide for industrial use—Determination of sodium hydroxide and sodium carbonate content
GB/T 4348.2 Sodium hydroxide for industrial use—Determination of sodium chloride content—Mercurimetric method
GB/T 4348.3 Sodium hydroxide for industrial use—Determination of iron content—1, 10-phenanthroline photometric method
GB/T 6678 General principles for sampling chemical products
GB/T 6679 General rules for sampling solid chemical products
GB/T 6680 General rules for sampling liquid chemical products
GB/T 7698 Sodium hydroxide for industrial use—Determination of carbonates content—Titrimetric method
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 9725 Chemical reagent—General rule for potentiometric titration
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GB/T 11213.2 Sodium hydroxide for chemical fiber use—Determination of sodium chloride content—Spectrometric method
GB/T 15915 Packing containers—Caustic alkali steel drum
3 Symbols
For the purposes of this document, the following symbols apply.
IL——Sodium hydroxide for liquid industrial use;
IS——Sodium hydroxide for solid industrial use.
4 Requirements
4.1 Appearance The main body of solid sodium hydroxide (including flake, granular, block, etc.) is white and shiny, and micro strip color is allowed. Liquid sodium hydroxide is colorless, transparent and thick liquid.
4.2 Sodium hydroxide for industrial use shall comply with the provisions in Table 1.
Table 1 Indexes of sodium hydroxide for industrial use In % (mass fraction)
Item Model rule
IS IL
I II I II III
Index
Sodium hydroxide ≥ 98.0 70.0 50.0 45.0 30.0
Sodium carbonate ≤ 0.8 0.5 0.5 0.4 0.2
Sodium chloride ≥ 0.05 0.05 0.05 0.03 0.008
Ferric oxide ≤ 0.008 0.008 0.005 0.003 0.001
5 Sampling
5.1 Products are inspected in batch. For solid sodium hydroxide products packaged in iron drums, the packaging quantity of each pot shall be taken as a batch; for bagged flake, granular, block and other solid sodium hydroxide products, the production volume per day or each production cycle shall be taken as a batch; for liquid sodium hydroxide products, the storage tank or tanker shall be taken as a batch. For users, the sodium hydroxide products received each time shall be taken as a batch.
5.2 Solid sodium hydroxide products packaged in iron drums shall be sampled randomly according to 5% of the total drums of a single batch, and shall not be less than 3 drums in small batches. Cut the drum skin along its the vertical interface, split the sodium hydroxide, and quickly take representative samples from the upper, middle and lower parts. Divide the samples into two clean and dry wide mouth bottles with stoppers, polyethylene bottles or self-sealing bags, and seal them. The amount of each sample shall not be less than 500g.
The manufacturer can take molten sodium hydroxide as laboratory sample for inspection before packaging.
5.3 The bagged solid sodium hydroxide products shall be sampled randomly according to the number of sampling units specified in GB/T 6678. Unpack the packaging bag and quickly take representative samples according to the provisions of GB/T 6679. Mix the samples evenly, pack them into two clean and dry wide mouth bottles with stoppers, polyethylene bottles or self-sealing bags, and seal them. The amount of each sample shall not be less than 500g.
The manufacturer can take representative samples as laboratory samples on the packaging line for inspection.
5.4 Liquid sodium hydroxide products shall be taken from the upper, middle and lower parts of the tanker or storage tank in accordance with the provisions of GB/T 6680. Mix the samples evenly, pack them into two clean and dry wide mouth bottles with stoppers, and polyethylene bottles, and seal them. The amount of each sample shall not be less than 500 mL.
The manufacturer can take representative samples as laboratory samples at the storage tank sampling port of the fully mixed and finished product for inspection.
5.5 One sample is used for inspection and one for preparation. The sample container shall be labeled with: manufacturer name, product name, specification and model, batch number or production date, sampling date, sampler, sampling amount, etc.
Foreword i
1 Scope
2 Normative references
3 Symbols
4 Requirements
5 Sampling
6 Test methods
7 Inspection rules
8 Marking, packaging, transportation and storage
Annex A (Normative) Determination of sodium chloride content in sodium hydroxide by potentiometric titration method
