Anions

GAS CHROMATOGRAPHY

METHOD

SOP C.27.1.

The sample is allowed to react with methyl alcohol/BF₃, whereby the carboxyl group, including the acetate and trifluoroacetate groups, are converted to their corresponding methyl esters. Careful extraction with a suitable solvent allows for the recovery of analyte methyl esters which are then subsequently separated and quantified by capillary gas chromatography.

SPECIFICATIONS

• generic validation
• Detected and quantified ions: acetate, trifluoroacetate
• Range acetate: 0.1 – 27 %
• LOQ acetate: 0.1%
• Range trifluoroacetate: 0.1 – 27 %
• LOQ trifluoroacetate: 0.1%
• RSD: ≤7% 

REPORTED RESULTS

• amount of anion in %

SAMPLE REQUIREMENTS

• 2 mg (single analysis), 3 mg (duplicate analysis)

ADVANTAGES

• solvent solubility in water is not required
• even strongly adsorbed ions are determined

ADDITIONAL SERVICES

• Please contact us for a substance specific validation

ION CHROMATOGRAPHY

METHOD

SOP C.32.1.

The separation mechanism of IC is based on an anion exchange displacement process occurring between the analyte ions, the stationary phase and eluent ions. 

SPECIFICATIONS

• generic validation
• Detected and quantified ions: acetate, trifluoroacetate, fluoride, chloride, bromide, nitrate, sulphate and phosphate.
• Range: 0.05 – 35%
• SD: ≤ 0.05%
• RSD: ≤ 10%

REPORTED RESULTS

• amount of anion in %

SAMPLE REQUIREMENT

• 4 mg (duplicate analysis) – analysis in duplicate is highly recommended
• sample solubility in water is mandatory

ADVANTAGES

• lower LOQ than our determination by GC
• quantification of inorganic anions possible

ADDITIONAL SERVICES

• Please contact us for a substance specific validation