ASTM E291-18 rus PDF

Full title and description

ASTM E291-18 — Standard Test Methods for Chemical Analysis of Caustic Soda and Caustic Potash (Sodium Hydroxide and Potassium Hydroxide). This standard provides validated laboratory test procedures for the chemical analysis of commercial caustic soda (NaOH) and caustic potash (KOH) in liquid and solid forms, with methods for determining total alkalinity, carbonate content, chloride, iron, sulfate and related analytes.

Abstract

ASTM E291-18 collects a set of analytical methods commonly used to verify the composition and purity of sodium hydroxide and potassium hydroxide products. The standard presents titrimetric, volumetric, gravimetric, photometric and ion-selective techniques applicable across typical commercial concentrations (e.g., 50 and 73 % NaOH liquors; 45 % KOH liquor; and anhydrous solids). Methods are expressed in SI units and include safety and sample-handling notes.

General information

• Status: Active (current edition E291-18, 2018).
• Publication date: January 1, 2018 (designation year 2018).
• Publisher: ASTM International (ASTM).
• ICS / categories: 71.060.40 (Bases).
• Edition / version: E291-18 (2018 revision of E291 series).
• Number of pages: 16 pages (standard document length).

Scope

The standard covers analytical procedures typically required for commercial caustic soda (sodium hydroxide) and caustic potash (potassium hydroxide). It applies to 50 % and 73 % NaOH liquors, 45 % KOH liquor, and anhydrous solid forms (flakes, powder, etc.). Procedures include determination of total alkalinity (titrimetric), carbonate (gas‑volumetric and gravimetric), chloride (titrimetric, potentiometric, ion‑selective electrode), iron (photometric) and sulfate (gravimetric). Units are presented in SI; users are directed to review safety data sheets (SDS) and follow appropriate laboratory safety practices.

Key topics and requirements

• Alkalinity (total) determination by titration for typical commercial concentrations.
• Carbonate analysis by gas‑volumetric and by gravimetric procedures, with stated minimum detectable masses.
• Chloride determination: titrimetric, potentiometric titration and ion‑selective electrode (ISE) options for different concentration ranges.
• Iron determination by photometric (colorimetric) methods with low µg/g detection limits.
• Sulfate determination by gravimetric precipitation with stated lower limits of determination.
• Specification of SI units, rounding rules for reporting (Practice E29), and safety/handling notes referencing SDS guidance.

Typical use and users

Primary users are analytical and QC laboratories in chemical manufacturing (producers of NaOH and KOH), users in pulp & paper, detergents and soap production, water treatment facilities, materials inspection labs, shipping/receiving QA, and standards laboratories that verify supplier certificates of analysis. The methods are used for incoming material inspection, in‑process checks and final product release testing.

Related standards

Related ASTM methods and documents include adjacent industrial chemical analysis standards and reagent specifications commonly referenced for sample preparation and reporting (examples include other ASTM industrial-chemistry test methods and reagent/water specifications). A 5‑year review/revision work item (WK85249) was initiated to revise E291-18; users should check ASTM for the latest revision activity.

Keywords

caustic soda, caustic potash, sodium hydroxide, potassium hydroxide, alkalinity, carbonate, chloride, iron, sulfate, titration, ion‑selective electrode, photometric, gravimetric, chemical analysis, bases.

FAQ

Q: What is this standard?

A: ASTM E291-18 is a collection of standardized laboratory test methods for chemical analysis of caustic soda (NaOH) and caustic potash (KOH), intended to provide consistent procedures for determining purity and impurity levels in commercial products.

Q: What does it cover?

A: It covers analytical procedures for total alkalinity, carbonate (gas and gravimetric), chloride (titrimetric, potentiometric, ISE), iron (photometric) and sulfate (gravimetric) for specified concentration ranges and product forms (liquors and anhydrous solids). Methods are given in SI units and include sample handling and safety notes.

Q: Who typically uses it?

A: Chemical manufacturers, quality control laboratories, producers and users of NaOH and KOH (pulp & paper, detergents, industrial processors), regulatory and inspection labs, and anyone requiring standardized test procedures for caustic materials.

Q: Is it current or superseded?

A: The E291-18 edition (published January 1, 2018) is the current published edition. A revision project (ASTM WK85249) was opened for periodic review/revision; users should confirm whether a newer edition has been published since 2018 before assuming E291-18 is still the latest.

Q: Is it part of a series?

A: Yes — E291 is part of a family of ASTM test methods covering chemical analysis of industrial chemicals and bases; earlier editions and related ASTM test methods address complementary analytes and sample types. E291 has been revised periodically (previous editions include E291-09, E291-04, etc.).

Q: What are the key keywords?

A: caustic soda, caustic potash, sodium hydroxide, potassium hydroxide, alkalinity, carbonate, chloride, iron, sulfate, titration, ion‑selective electrode, gravimetric, photometric.