Message - 7th IAL Symposium

The 7 th International Association for Lichenology Symposium 2012
(4I-P16) Submission ID: IAL0243-00003
DETERMINATION OF IRON (Fe) AND ZINC (Zn) CONTENTS IN SOME LICHENS
IN NONGSOUNG DISTRICT, MUKDAHAN PROVINCE, THAILAND
Keoinpaeng S. 1 , Chantiratikul P. 1 , Papong K. 2
1 Faculty of Science, Department of Chemistry, Mahasarakham University, Thailand
2 Faculty of Science, Department of Biology, Mahasarakham University, Thailand
This research was to study the concentration of Fe and Zn contents in thallus of Dirinaria picta, Laurera
benguelensis, Parmotrema tinctorum and Pyxine coccifera from Nongsoung District, Mukdahan Province. Atomic
Absorption Spectrometry (AAS) technique was used to determine amounts of metals in corticolous lichens. The
high concentration of Fe were found in Pyxine coccifera and Dirinaria picta; 0.959 mg g -1 and 0.853 mg g -1 ,
respectively. In other hand, Zn concentration was low such as Parmotrema tinctorum 0.293 mg g -1 , Laurera
benguelensis 0.213 mg g -1 . The trace element absorption in lichens thallus can be used for bio-monitoring of air
pollution.
(4I-P17) Submission ID: IAL0244-00001
MEASURING NITRATE AND SULFATE DEPOSITION IN LICHENS AFTER TRANSPLANTATION
TO POLLUTED SITES IN BANGKOK, THAILAND
Sriviboon C. 1 , Boonpragob K. 2 , Sriviboon T. 1 , Jhumpasri T. 1 , Boonpeng C. 2
1 Chemistry, Ramkhamhaeng University, Bangkok, Thailand
2 Biology, Ramkhamhaeng University, Bangkok, Thailand
The ion chromatography was performed to measure nitrate and sulfate deposition in lichens transplanted
to public parks around Bangkok city. The inorganic anions in lichens were separated and quantify by using column
IonPac AS12A and suppressed conductometric detection with ASRS-300 (4 mm). The eluent was a mixture of
2.7 mM Na 2 CO 3 and 0.3 mM NaHCO 3 by isocratic elution. The chromatographic conditions were validated in
terms of detection limit, precision and linearity. It was found that the detection limit of nitrate and sulfate were
0.014 mg/L and 0.019 mg/L respectively, and precision in seven repetitions (%RSD) of two ions were more than
2.5% at concentration lower than 1 ppm and less than 0.6 % at concentration higher than 1 ppm. The linearity
was obtained by correlation coefficient (R 2 ) better than 0.998. The results found that the amounts of nitrates and
sulfates in transplanted lichens from eleven public parks had increasing tendency with exposure time in Bangkok
during 19/9/2010 to 5/2/2011. However, the amount of both ions in the last sampling period 20/4/2011, declined
in all public parks because of rain before samples were collected. Nevertheless these amounts were still higher
than those at Khao Yai National Park and the control site. No correlations, R 2 below 0.3, were found between
nitrate and sulfate from CS, KY, BS and SP, whereas the other sites had R 2 higher than 0.5.
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4I-P