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126 SCP SCIENCE
Solid Phase Extraction
DigiSEP
Molecular Recognition Technology Gel
Sample preparation and complex matrices represent two of the used to remove NO-3, SO-4, and Cl- ions from a sample matrix. In
greatest challenges in Atomic Spectroscopy. addition, newer MRTs are in development.
In the first case, if the samples are not prepared, i.e. digested and Some common applications of DigiSEP MRT Cartridges
pre-treated prior to analysis, the data obtained can be meaningless. are:
In the second case, if the matrices are composed of a complex
mixture of salts, viscous acids and/or particulates, it may be next to ·· Chelating Resins can separate difficult to analyze transition
impossible to detect very low levels of metals. metals from high Alkali matrices
SCP SCIENCE can help the Atomic Spectroscopist with both of ·· Metal ions can be collected from acid digestion matrices
these problems. We have seen in the previous chapter by carefully ·· Heavy metals can be separated from oil and other
monitoring and controlling sample temperature, the digested metal
recoveries can be improved. However, the problem of complex organic matrices
matrices remains a hurdle in the analysis of metals by Atomic ·· Hg can be captured, collected and concentrated
Spectroscopy; independent of whether it is GFAA, ICP-OES ·· Precious metals can be collected and retained
or ICP-MS. ·· Pb can be collected and separated from other elements
·· Radioactive elements can be collected for nuclear fuel industry
The solution to elemental analysis in complex matrices comes in
the form of sample preparation using DigiSEP Cartridges. Highly Binding resins are on a silica gel base and can be regenerated
selective Molecular Recognition Technology (MRT) gel is ideal for between uses. The products are available in cartridge form (3
Alkali and Alkaline Earth Metals, Precious Metals, Cr (exclusively), ml / 500 mg), in 50 and 100 mm x 4.6 mm PEEK body liquid
and Hg (exclusively) retention. DigiSEP Cartridges can also be chromatography columns, or in powder form in bottles of 10 grams.
Toxic Metals
specifications
DigiSEP Pb-0.1, 02 500 mg / 1 ml Sample DigiSEP Cr-02 200 mg / 3 ml, AN-02 200 mg / 3 ml
1 ml/min. Pure water 1 ml x 3 pH 0-10 Sample Conditioning (5~10 ml / min.)
1 mol / L HNO3 pH 0~6 3 mol / L HCI 3 ml x 2
Water 20 ml + 5 mmol / L Phosphate Buffer 5 ml
Loading 0.5 ml/min.
Pure water 5 ml x 2
Methods: Sample Loading
1) 0.03 mol / L EDTA-NH4 [pH 9-10] 2 ml x 5
Elute 2) 3.6 mol / L KCI 2 ml x 5 0.5~5 ml / ml Rince
A) 5 mmol / L Phosphate Buffer 3 ml
Acid Reagent Color fast reagent etc. B) 0.1 mol / L HCI 2 ml x 2 + water 3 ml x 3-5
1~2 ml / min. Elute A) 4 mol / L NaCI B) 4 mol / L HNO3
1) Analysis by ICP-OES 1) Diphenil-carbazide colorimetric Assay: UV / VIS 530 nm
2) Analysis by UV/VIS 520 mm
2) Analysis by ICP-OES: Cr 205.560 nm, 206.158 nm, 267.716 nm
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