We used an optimized HG-CT-AAS technique with detection limits of 12 17 pg As for analysis of As species in BECs.
We analyzed As species in BECs by a recently developed automated HG-CT-AAS technique using a PerkinElmer Model 5100 PC AA spectrometer equipped with the multiatomizer and a FIAS200 flow injection accessory (Hernández-Zavala et al. 2008; Matous ek et al. 2008).
The concentrations of Na and K were determined using the Shimadzu AA-7000 FlAAS analyticalical technique (Shimadzu, Japan).
Historically elemental analysis was carried out by either flame or graphite furnace atomic absorption spectroscopy (AAS), a technique that enables quantification of the average total metal content from a digested sample at parts per billion (μg/L) sensitivity, one metal at a time.
The concentration of arsenic C(M As ) in the SPM samples has been evaluated using AAS-HG technique by following equation.
In general, participants using atomic absorption spectrometry (AAS -based techniques reported lower vAAS -based techniquesipants who used ICP-based techniques (ICP-MS and ICP-AES).
Laboratories using HG-AAS-based techniques for the final determination of As should be particularly careful.
AAS-based techniques can be used if high temperatures are used for sample digestion (for instance dry ashing at 450°C), as shown by L21.
For iAs determination, five out of the seven laboratories that obtained satisfactory z-scores in IMEP-39, used AAS-based techniques.
The lower values reported by participants using AAS-based techniques resulted in a significantly lower percentage of satisfactory z-scores (35%) when compared with those obtained by laboratories using ICP-based techniques (87%).
In IMEP-39, five out of the seven laboratories which obtained a satisfactory z-score for iAs, have used AAS-based techniques, showing that sound determinations of iAs can be made without the use of expensive sophisticated instrumentation.
