ASTM D4374-00
Standard Test Methods for Cyanides in Water--Automated Methods for Total Cyanide, Acid dissociable Cyanide, and Thiocyanate

Standard No.

ASTM D4374-00

Release Date

2000

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D4374-06

Latest

ASTM D4374-06

Scope

1.1 These test methods cover the determination of different species of cyanides and thiocyanate in water and waste water, namely dissociable cyanide, total cyanide, and thiocyanate (1)

1.1.1 Total Cyanide--This test method determines all the dissociable cyanides and the strong metal-cyano-complexes, such as ferrocyanide [Fe(CN)₆]^4-, ferricyanide [Fe(CN)₆]^3-, hexacyanocolbaltate [Co(CN)₆]^3-, and those of gold and platinum.

1.1.2 Dissociable Cyanide --This test method basically determines free cyanides, as CN^- and HCN, and weak metal-cyano-complexes such as [Cd(CN)₄]²- and [Mn(CN)₆]_3-. Iron complexes are not included.

1.1.3 Cyanide complexes, strong complexes like those of iron, cobalt, etc., can be determined by difference, that is, cyanide complexes = total cyanides - dissociable cyanides.

1.1.4 Thiocyanate --This test method determines the thiocyanate as the difference between another measurement that includes total cyanide plus thiocyanate and the value of total cyanide, that is, thiocyanate = total cyanide plus thiocyanate - total cyanide.

1.2 Cyanates and cyanogen halides are not detected. Cyanogen chloride hydrolyzes to cyanate at the pH of sample preservation ([>=]12).

1.3 Most of the organo-cyano-complexes are not measured, with the exception of the weak cyanohydrins.

1.4 These test methods apply to different types of water, waste water (raw sewage, sludge, and effluent), sludge, some industrial waste, and sediments. Sample matrixes should be evaluated by the user. The reported precision and bias (see Section 16) may not apply to all samples.

1.5 The values stated in SI units are to be regarded as the standard.

1.6 This standard does not purport to address all of the safety concerns, 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 precautionary statements, see Section 9.

ASTM D4374-00 Referenced Document

• ASTM D1129 Standard Terminology Relating to Water
• ASTM D1193 Standard Specification for Reagent Water
• ASTM D2036 Standard Test Methods for Cyanides in Water
• ASTM D3370 Standard Practices for Sampling Water from Closed Conduits
• ASTM D3856 Standard Guide for Good Laboratory Practices in Laboratories Engaged in Sampling and Analysis of Water
• ASTM D3864 Standard Guide for Continual On-Line Monitoring Systems for Water Analysis
• ASTM D4193 Standard Test Method for Thiocyanate in Water
• ASTM D4210 Standard Practice for Intralaboratory Quality Control Procedures and a Discussion on Reporting Low-Level Data
• ASTM D5788 Standard Guide for Spiking Organics into Aqueous Samples
• ASTM D5789 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Organic Constituents

ASTM D4374-00 history

• 2006 ASTM D4374-06 Standard Test Methods for Cyanides in Water-Automated Methods for Total Cyanide, Weak Acid Dissociable Cyanide, and Thiocyanate
• 2000 ASTM D4374-00 Standard Test Methods for Cyanides in Water--Automated Methods for Total Cyanide, Acid dissociable Cyanide, and Thiocyanate