Determining Inorganic Anions in Aqueous Matrices

These test methods, which use capillary ion electrophoresis with indirect UV detection, can be used for measuring the concentration of sulfate, ortho-phosphate, nitrate, chloride, bromide, and fluoride ions, dissolved in aqueous matrices. They are applicable for ground water, wastewater, and drinking water samples.

Measurement Method

Capillary zone electrophoresis with indirect UV detection at a wavelength of 254 nm is the basis of this measurement method.

Measurement Range

Anions Measurement range, mg/L
Chloride, bromide, nitrite, sulfate, nitrate, ortho-phosphate 0.1–50
Fluoride 0.1–25

Equipment and Reagents

The CAPEL capillary electrophoresis system from Lumex Instruments is used for these measurements. Data collection, acquisition, output, and processing are carried out with the use of a personal computer running under the Windows® operating system. This must also have the ELFORUN dedicated software package installed. Each of the reagents must be of analytical grade or superior.

Examples of Real Analyses

BGE: Chromate, with TTAOH, CHES, and calcium gluconate

Capillary: Leff/Ltot 50/60 cm, ID 75 μm

Injection: 300 mbar x sec

Voltage: – 15 kV

Temperature: 25 °С

Detection: 254 nm, indirect

Sample: Test solution

1 – chloride (20 mg/L)

2 – nitrite (20 mg/L)

3 – sulfate (20 mg/L)

4 – nitrate (20 mg/L)

5 – fluoride (10 mg/L)

6 – phosphate (20 mg/L)

Sample: Tap water

Measurement results:

1 – chloride (7.78 mg/L)

2 – sulfate (26.3 mg/L)

3 – nitrate (1.66 mg/L)

4 – carbonate

The contents of this paper are subject to change without notice.

About Lumex Instruments

For almost 30 years, Lumex Instruments has been developing and manufacturing laboratory and industrial analytical equipment, instruments, and procedures.

Our products are used for environmental control, water and wastewater treatment, agriculture, food and beverage quality and safety control, energy industry, and pharmaceutical and biochemical applications. Lumex Instruments offers more than 120 applications for the measurement of organic and inorganic chemicals in liquid, solid and gas.

We offer both traditional and new ingenious solutions, unique technologies and classical equipment, well-established reliable applications and innovative methods. From the beginning of the company, we have developed, manufactured and sold more than 16,500 instruments.

Our products include:

  • capillary electrophoresis systems
  • PCR analyzers
  • atomic absorption spectrometers (including mercury analyzers and monitors)
  • FTIR and NIR spectrometers
  • fluorimeters and more

We combine high-quality standards with the flexible customized approach because we care about the efficiency of our customer operations. All our innovations are targeted to make the analyses cost-efficient, easy to run, and the instruments easy to maintain and service. We proudly deliver our products and services all around the world and we enjoy working with our valued customers and partners in many industries and countries.

With customers in more than 90 countries worldwide, Lumex Instruments has several offices and multiple distributors around the world.

A significant number of our applications are developed in accordance with international standards, such as ASTM, ISO, EN and EPA.

Facts and figures:

  • More than 30 models of analytical instruments developed starting from 1991
  • Over 20 patents
  • 20% market share of the portable mercury analyzers
  • Over 120 applications
  • Over 350 employees, and 25% of them are involved in the development of new applications and instruments

The customers who selected Lumex Instruments include: BP, Enel, Royal Dutch Shell, PETRONAS, PetroChina, Chevron, UNIDO, SGS, Carlsberg Group, Unilever, PepsiCo, Nestle, Princeton University, and others.

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Last updated: Jul 24, 2020 at 5:33 AM


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