Hexavalent Chromium

 

SM 3500-Cr B

Scope:

The colorimetric method is useful for the determination of hexavalent chromium in a natural or treated water in the range from 100 to 1000 ug/L. This range can be extended by appropriate sample dilution or concentration and/or use of longer cell paths.

This procedure measures only hexavalent chromium, (Cr6+). For total chromium determination, acid-digest the sample and follow with a suitable instrumental analysis technique. The hexavalent chromium is determined colorimetrically by reaction with diphenylcarbazide in acid solution. A red-violet colored complex of unknown composition is produced. The reaction is very sensitive.

-Standard Methods Online – Standard Methods for the Examination of Water and Wastewater

Method 3500-Cr B
Hold Time24 hrs
PreservationRefrigerate to 4 degree C
Sample Volume250 mL
Collection Methodgrab
Instrumentationspectrometer
Method RefernceSM 3500-Cr B

 

Analyte List

AnalyteFormulaCAS Number
Hexavalent ChromiumCr 6+

*Please contact our project management team for more information about reporting limits and other specific project needs.

Method 218.6

Scope:

This method provides procedures for determination of dissolved hexavalent chromium (as CrO4 2-) in drinking water, groundwater, and industrial wastewater effluents.

An aqueous sample is filtered through a 0.45 um filter and the filtrate is adjusted to a pH of 9-9.5 with a concentrated buffer solution. A measured volume of the sample (50-250 uL) is introduced into the ion chromatograph. A guard column removes organics from the sample before the Cr (VI), as CrO4 2- , is separated on a high capacity anion exchange separator column. Post-column derivatization of the Cr (VI) with diphenylcarbazide is followed by detection of the colored complex at 530 nm.

-Method 218.6: Determination of Dissolved Hexavalent Chromium in Drinking Water, Groundwater, and Industrial Wastewater Effluents by Ion Chromatography, Rev. 3.3, EMMC Version, E.J. Arar, S.E. Long

Method Data

Method 218.6
Hold Time24 hours, though this can be extended through the use of the buffer solution as specified in the Methods Update Rule (March 12, 2007).
PreservationRefrigerate to 4 degree C
Sample Volume250 mL
Collection MethodGrab
InstrumentationIon Chromotography
Method RefernceSM 218.6

 

Analyte List

AnalyteFormulaCAS Number
Hexavalent ChromiumCr 6+

*Please contact our project management team for more information about reporting limits and other specific project needs.

Method E 7199

Scope:

This method provides procedures for the determination of hexavalent chromium in drinking water, groundwater, and industrial wastewater effluents. Samples containing high levels of anionic species such as sulfate and chloride may cause column overload. Samples containing high levels of organics or sulfides cause rapid reduction of soluble Cr(VI) to Cr(III).

An aqueous sample is filtered through a 0.45 um filter and the filtrate is adjusted to a pH of 9-9.5 with a concentrated buffer solution. A measured volume of the sample (50-250 uL) is introduced into the ion chromatograph. A guard column removes organics from the sample before the Cr (VI), as CrO4 2- , is separated on a high capacity anion exchange separator column. Post-column derivatization of the Cr (VI) with diphenylcarbazide is followed by detection of the colored complex at 530 nm.

-SW-846 Online: Test Methods for Evaluating Solid Waste, Physical/Chemical Methods

Method Data

Method E 7199
Hold Time24 hours
PreservationRefrigerate to 4 degree C
Sample Volume250 mL
Collection MethodGrab
InstrumentationIon Chromotography
Method RefernceSW-846, E 7199

 

Analyte List

AnalyteFormulaCAS Number
Hexavalent ChromiumCr 6+

*Please contact our project management team for more information about reporting limits and other specific project needs.

Method 3060A

Scope:

Method 3060 is an alkaline digestion procedure for extracting hexavalent chromium [Cr(VI)] from soluble, adsorbed, and precipitated forms of chromium compounds in soils, sludges, sediments, and similar waste materials. To quantify total Cr(VI) in a solid matrix, three criteria must be satisfied: (1) the extracting solution must solubilize all forms of Cr(VI), (2) the conditions of the extraction must not induce reduction of native Cr(VI) to Cr(III), and (3) the method must not cause oxidation of native Cr(III) contained in the sample to Cr(VI). Method 3060 meets these criteria for a wide spectrum of solid matrices. Under the alkaline conditions of the extraction, minimal reduction of Cr(VI) or oxidation of native Cr(III) occurs.

This method uses an alkaline digestion to solubilize both water-insoluble (with the exception of partial solubility of barium chromate in some soil matrices) and water soluble Cr(VI) compounds in solid waste samples. The pH of the digestate must be carefully adjusted during the digestion procedure.

SW-846 Test Method 3060A: Alkaline Digestion for Hexavalent Chromium, Rev 1, December 1996

Method Data

Method 3060A
Hold Time30 days
PreservationRefrigerate to 4 degree C
Sample Volume8 oz jar
Collection MethodGrab
InstrumentationIon Chromotography
Method RefernceSW-846, 3060A

 

Analyte List

AnalyteFormulaCAS Number
Hexavalent ChromiumCr 6+

*Please contact our project management team for more information about reporting limits and other specific project needs.

Request A Quote

If you would like us to provide a quote for laboratory analysis, just provide us with information about your project.