ASTM D7237-06
Standard Test Method for Aquatic Free Cyanide with Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection
- Standard No.
- ASTM D7237-06
- Release Date
- 2006
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM D7237-10
- Latest
- ASTM D7237-18
- Scope
Cyanide and hydrogen cyanide are highly toxic. Regulations have been established to require the monitoring of cyanide in industrial and domestic wastes and surface waters.3
It is useful to determine the aquatic free cyanide to establish an index of toxicity when a wastewater is introduced to the pH and temperature of the natural environment.
This test method is applicable for natural water, saline waters, and wastewater effluent.
1.1 This test method is used to establish the concentration of aquatic "free" cyanide in an aqueous wastewater or effluent. The test conditions of this method are used to measure free cyanide (HCN and CN-) and cyanide bound in the metal-cyanide complexes that are easily dissociated into free cyanide ions at the pH of the aquatic environment ranging from pH 6 to pH 8. The extent of HCN formation is less dependent on temperature than the pH; however, the temperature can be regulated if deemed necessary to further simulate the actual aquatic environment.
1.2 The aquatic free cyanide method is based on the same instrumentation and technology that is described in standard test method D 6888, but employs milder conditions (pH 6-8 buffer versus HCl in the reagent stream), and does not utilize ligand displacement reagents.
1.3 The aquatic free cyanide measured by this procedure should be similar to actual levels of HCN in the original aquatic environment. This in turn may give a reliable index of toxicity to aquatic organisms.
1.4 This procedure is applicable over a range of approximately 2 to 500 g/L (parts per billion) aquatic free cyanide. Sample dilution may increase cyanide recoveries depending on the cyanide speciation; therefore, it is not recommended to dilute samples. Higher concentrations can be analyzed by increasing the range of calibration standards or with a lower injection volume. In accordance with Guide E 1763 and Practice D 6512 the lower scope limit was determined to be 9 g/L for chlorinated gold leaching barren effluent water.
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. Specific hazard statements are given in Section and Section .
ASTM D7237-06 Referenced Document
- ASTM D1129 Standard Terminology Relating to Water
- ASTM D1193 Standard Specification for Reagent Water
- ASTM D1293 Standard Test Methods for pH of Water
- ASTM D2036 Standard Test Methods for Cyanides in Water
- ASTM D2777 Standard Practice for Determination of Precision and Bias of Applicable Methods of Committee D-19 on 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 D4841 Standard Practice for Estimation of Holding Time for Water Samples Containing Organic and Inorganic Constituents*， 2018-10-15 Update
- ASTM D5847 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
- ASTM D6512 Standard Practice for Interlaboratory Quantitation Estimate*， 2024-04-22 Update
- ASTM D6696 Standard Guide for Understanding Cyanide Species*， 2023-11-15 Update
- ASTM D6888 Standard Test Method for Available Cyanides with Ligand Displacement and Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection*， 2023-11-15 Update
- ASTM E1763 Standard Guide for Interpretation and Use of Results from Interlaboratory Testing of Chemical Analysis Methods
- ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ASTM D7237-06 history
- 2018 ASTM D7237-18 Standard Test Method for Free Cyanide and Aquatic Free Cyanide with Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection
- 2015 ASTM D7237-15a Standard Test Method for Free Cyanide and Aquatic Free Cyanide with Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection
- 2015 ASTM D7237-15 Standard Test Method for Free Cyanide and Aquatic Free Cyanide with Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection
- 2010 ASTM D7237-10 Standard Test Method for Free Cyanide with Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection
- 2006 ASTM D7237-06 Standard Test Method for Aquatic Free Cyanide with Flow Injection Analysis (FIA) Utilizing Gas Diffusion Separation and Amperometric Detection
