Significance and Use
Most waters rarely contain more than trace concentrations of cobalt from natural sources. Although trace amounts of cobalt seem to be essential to the nutrition of some animals, large amounts have pronounced toxic effects on both plant and animal life.
1.1 These test methods cover the determination of dissolved and total recoverable cobalt in water and wastewater by atomic absorption spectrophotometry. Three test methods are included as follows:
| Concentration Range||Sections|
|Test Method A—Atomic Absorption, Direct|| 0.1 to 10 mg/L||7 to 16|
|Test Method B—Atomic Absorption, Chelation-Extraction||10 to 1000 μg/L|| 17 to 26|
|Test Method C—Atomic Absorption, Graphite Furnace|| 5 to 100 μg/L|| 27 to 36|
1.2 Test Method A has been used successfully with reagent water, potable water, river water, and wastewater. Test Method B has been used successfully with reagent water, potable water, river water, sea water and brine. Test Method C was successfully evaluated in reagent water, artificial seawater, river water, tap water, and a synthetic brine. It is the analyst's responsibility to ensure the validity of these test methods for other matrices.
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 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 hazard statements, see 11.7.1, 21.10, and 23.10.
7.1 This test method covers the determination of dissolved and total recoverable cobalt in most waters and waste waters. It is the user's responsibility to ensure the validity of this test method in a particular matrix.
7.2 This test method is applicable in the range from 0.1 to 10 mg/L of cobalt. The range may be extended to concentrations greater than 10 mg/L by dilution of the sample.
17.1 This test method covers the determination of dissolved and total recoverable cobalt in most waters and brines. It is the user's responsibility to ensure the validity of this test method in a particular matrix.
17.2 This test method is applicable in the range from 10 to 1000μ g/L of cobalt. The range may be extended to concentrations greater than 1000 μg/L by dilution of the samples.
27.1 This test method covers the determination of dissolved and total recoverable cobalt in most waters and wastewaters.
27.2 This test method is applicable in the range from 5 to 100 μg/L of cobalt. The range can be increased or decreased by varying the volume of sample injected or the instrumental settings. High concentrations may be diluted but preferably should be analyzed by direct aspiration atomic absorption spectrophotometry.
27.3 This test method has been used successfully with reagent water, lake water, river water, well water, filtered tap water, condensate from a medium Btu coal gasification process, and effluent from a wood treatment plant. It is the user's responsibility to ensure the validity of this test method for waters of untested matrices.
27.4 The analyst is encouraged to consult Practice D 3919 for a general discussion of interferences and sample analysis procedures for graphite furnace atomic absorption spectrophotometry.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D858 Test Methods for Manganese in Water
D1066 Practice for Sampling Steam
D1068 Test Methods for Iron in Water
D1129 Terminology Relating to Water
D1193 Specification for Reagent Water
D1687 Test Methods for Chromium in Water
D1688 Test Methods for Copper in Water
D1691 Test Methods for Zinc in Water
D1886 Test Methods for Nickel in Water
D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
D3370 Practices for Sampling Water from Closed Conduits
D3557 Test Methods for Cadmium in Water
D3559 Test Methods for Lead in Water
D3919 Practice for Measuring Trace Elements in Water by Graphite Furnace Atomic Absorption Spectrophotometry
D4841 Practice for Estimation of Holding Time for Water Samples Containing Organic and Inorganic Constituents
D5810 Guide for Spiking into Aqueous Samples
D5847 Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
atomic absorption; chelation; cobalt; graphite furnace; water; Spectrophotometry--atomic absorption (water/wastewater); Total recoverable elements (in water); Chelation; Cobalt content--water; Graphite furnace atomic absorption spectrometry (GFAAS); Inorganic compounds--water ;
ICS Number Code 13.060.50 (Examination of water for chemical substances)
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Citing ASTM Standards
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