Identifying Macroelements and Trace Elements in Water Samples

This method has been designed to determine the concentration of elements in water samples from various sources, including tap water, natural water, mineral waters, wastewater, drinking (incl. bottled) water, etc.

Lumex Instruments presents the MGA-1000, a Graphite Furnace Atomic Absorption Spectrometer (GFAAS), which can measure both trace and macroelements in a single instrument.

The Lumex Instruments' analysis techniques and the instrument itself comply with the international regulations for water analysis by GFAAS. They are ideally suited for food testing, environment monitoring, pharmaceutical applications, and wastewater management.

Measurement Method

Trace Elements

Determination of trace elements with the MGA-1000 is based on a stabilized temperature platform furnace (STPF). This method complies with common standards for trace element determination, for example, US EPA Methods 7010, 200.9, etc. The full list of standards can be found on the Lumex Instruments website.

Table 1. Limits of quantification (LOQ) for trace elements with the Lumex Instruments MGA-1000

Element Al Ag As Ba Be Cd Co Cr Cu Fe Li Mn Mo Ni Pb Sb Se Sr Ti V Zn
LOQ, ppb (μg/L) 1 0.1 1 2 0.1 0.01 1 0.5 0.5 0.5 1 0.2 1 1 0.5 1 1 1 5 1 0.01

Macroelements

The MGA-1000 GFAAS system makes direct measurement of macroelements possible, through the implementation of precise graphite furnace temperature management and gas-phase dynamic dilution technologies.

Flammable gas is not required, and there is no time loss for switching from graphite furnace to flame.

Table 2. MGA-1000 macroelement measurement ranges (with dilution)

Element Na K Ca Mg
Measurement range, ppm (mg/L) 0.5-5000 0.5-5000 0.1-5000 0.1-5000

Highlights of GFAAS Analysis with MGA-1000

  • True versatility in use – there is no need for combined FAAS and GFAAS as MGA-1000 can analyze trace and macroelements in one
  • Low detection limits and wider measurement ranges provided by state-of-the-art Zeeman High-Frequency Polarization modulation (ZHFPM) background correction system
  • User-friendly design and a compact footprint
  • Affordable pricing

Equipment and Reagents

The starter pack for MGA-1000 Graphite Furnace Atomic Absorption Spectrometer includes Lumex Instruments’ Eltherm software and a compact and powerful water-cooling system.

If required for your specific application, optional graphite tubes will be included in the delivery set.

The only pressurized gas needed for operation of the MGA-1000 is argon.

To ensure accurate laboratory work, deionized (or bidistilled) water and standard reference materials for analyzed elements should be used, as well as the appropriate glassware, matrix modifiers, and some acids.

Measurement Procedures

Prior to analysis, the sample should be filtered and preserved.

An aliquot of the prepared sample should be injected into the graphite furnace of the spectrometer. The measurement is performed according to the analytical procedure for the specified element.

For each element, a recommended set of analytical parameters are provided.

The sample injection volume is between 10 and 40 μL.

The Eltherm software that is included in the starter pack collects and processes the measurement data.

This information has been sourced, reviewed and adapted from materials provided by Lumex Instruments.

For more information on this source, please visit Lumex Instruments.

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