ASTM D7511-09e1

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
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Designation: D7511 – 09
Standard Test Method for
Total Cyanide by Segmented Flow Injection Analysis, In-Line
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Ultraviolet Digestion and Amperometric Detection
This standard is issued under the fixed designation D7511; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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´ NOTE—A typographical error was editorially corrected in Section 8.13 in March 2010.
1. Scope D1193 Specification for Reagent Water
D2036 Test Methods for Cyanides in Water
1.1 This method is used for determining total cyanide in
D2777 Practice for Determination of Precision and Bias of
drinking and surface waters, as well as domestic and industrial
-
Applicable Test Methods of Committee D19 on Water
wastes. Cyanide ion (CN ), hydrogen cyanide in water (HC-
D3370 Practices for Sampling Water from Closed Conduits
N(aq)), and the cyano-complexes of zinc, copper, cadmium,
D3856 Guide for Good Laboratory Practices in Laborato-
mercury, nickel, silver, and iron may be determined by this
ries Engaged in Sampling and Analysis of Water
method. Cyanide ions from Au(I), Co(III), Pd(II), and Ru(II)
D4210 Practice for Intralaboratory Quality Control Proce-
complexes are only partially determined.
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dures and a Discussion on Reporting Low-Level Data
1.2 The method detection limit (MDL) is 1.0 µg/L cyanide
D5847 Practice for Writing Quality Control Specifications
andtheminimumlevel(ML)is3µg/L.Theapplicablerangeof
for Standard Test Methods for Water Analysis
the method is 3 to 500 µg/L cyanide using a 200-µL sample
D6696 Guide for Understanding Cyanide Species
loop. Extend the range to analyze higher concentrations by
D7365 Practice for Sampling, Preservation and Mitigating
sample dilution or changing the sample loop volume.
Interferences in Water Samples for Analysis of Cyanide
1.3 This method can be used by analysts experienced with
equipment using segmented flow analysis (SFA) and flow
3. Terminology
injectionanalysis(FIA)orworkingundertheclosesupervision
3.1 Definitions—For definitions of terms used in this test
of such qualified persons.
method, refer to Terminology D1129 and Guide D6696.
1.4 The values stated in SI units are to be regarded as
3.1.1 total cyanide—refers to all cyanide-containing com-
standard. No other units of measurement are included in this
pounds in a sample, including free cyanide, WAD cyanide
standard.
compounds, and strong metal cyanide complexes.
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 Prior to analysis, treat the sample to remove potential
priate safety and health practices and determine the applica-
interferences (Sections 4 and 8). Ultraviolet (UV) digestion
bility of regulatory limitations prior to use. Specific hazard
releases cyanide from cyanide complexes. Acid addition con-
statements are given in Note 2 and Section 9.
verts cyanide ion to hydrogen cyanide gas (HCN), which
2. Referenced Documents passes under a gas diffusion membrane. The hydrogen cyanide
2 gas diffuses through the membrane into an alkaline receiving
2.1 ASTM Standards:
solution, where it converts back to cyanide ion. A silver
D1129 Terminology Relating to Water
working electrode, silver/silver chloride reference electrode,
and platinum/stainless steel counter electrode at an applied
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This test method is under the jurisdiction of ASTM Committee D19 on Water
potential of zero volt amperometrically monitor the cyanide
andisthedirectresponsibilityofSubcommitteeD19.06onMethodsforAnalysisfor
ion. The current generated is proportional to the cyanide
Organic Substances in Water.
concentration present in the original sample.
Current edition approved Feb. 15, 2009. Published March 2009. DOI: 10.1520/
D7511-09.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on Withdrawn. The last approved version of this historical standard is referenced
the ASTM website. on www.astm.org.
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D7511 – 09
4.2 Calibrations and data are processed with the instru- alkaline receiving solution, reducing its pH. Treat effluents
ment’s data acquisition software. from high carbonate containing wastes, such as coal gasifica-
tion waste and atmospheric emission scrub wa
...