ASTM D1123 - 99(2015)
Standard Test Methods for Water in Engine Coolant Concentrate by the Karl Fischer Reagent Method
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Significance and Use
5.1 The total apparent water in engine coolant concentrate as determined by Karl Fischer titrations consists of the following: (1) water present in the original glycol base; (2) water added (for example, inhibitor solutions); (3) water of hydration of inhibitors (for example, Na2B4O7·5H2O); (4) water formed in the chemical reaction between borate and ethylene glycol, producing boratediol condensate and water; and (5) quantitative interference by the reaction of the reagent with inhibitors such as tetraborate or sodium hydroxide.
1. Scope
1.1 These test methods cover the determination of the water present in new or unused glycol-based coolant concentrates using a manual (Test Method A) or an automatic (Test Method B) coulometric titrator procedure.
1.2 Many carbonyl compounds react slowly with the Fischer reagent, causing a fading end point and leading to high results. A modified Fischer reagent procedure is included that minimizes these undesirable and interfering reactions.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazards statements see Sections 8 and 16.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D156 Test Method for Saybolt Color of Petroleum Products (Saybolt Chromometer Method)
D1176 Practice for Sampling and Preparing Aqueous Solutions of Engine Coolants or Antirusts for Testing Purposes
D1193 Specification for Reagent Water
E203 Test Method for Water Using Volumetric Karl Fischer Titration
ICS Code
ICS Number Code 71.100.45 (Refrigerants and antifreezes)
UNSPSC Code
UNSPSC Code 25174004(Engine coolant)
Referencing This Standard
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DOI: 10.1520/D1123-99R15
Citation Format
ASTM D1123-99(2015), Standard Test Methods for Water in Engine Coolant Concentrate by the Karl Fischer Reagent Method, ASTM International, West Conshohocken, PA, 2015, www.astm.org
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