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Çѱ¹ÇÏõȣ¼öÇÐȸ / v.36, no.3, 2003³â, pp.235-241
Àڿܼ±¿¡ ÀÇÇÑ Á¶·ù±â¿ø ¿ëÁ¸À¯±â¹°ÀÇ »ýºÐÇØµµ ¹× È­ÇÐÁ¶¼ºº¯È¯.
( Photoalteration in Biodegradability and Chemical Compositions of Algae- derived Dissolved Organic Matter )
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Àڿܼ±¿¡ ÀÇÇÑ Á¶·ù±â¿ø ¿ëÁ¸À¯±â¹°ÀÇ Æ¯¼ºº¯È­¸¦ Á¶»çÇϱâ À§ÇÏ¿© ¹è¾çÇÑ ³²Á¶·ù µÎÁ¾ (Microcystis aeruginosa, Oscillatoria agardhii)ÀÇ Ã¼¿Ü¹èÃâ¿ëÁ¸À¯±â¹°¿¡ Àڿܼ± ó¸®Àü°ú ó¸®ÈÄÀÇ »ýºÐÇØµµ¿Í À¯±â¹°ÀÇ È­ÇÐÀûÁ¶¼ºÀ» ºñ±³ÇÏ¿´´Ù. Àڿܼ±Ã³¸®´Â pyrex¿ë±â¿¡ ½Ã·á¸¦ ³Ö°í ÀΰøÀڿܼ±·¥ÇÁ(UVA: 40 W/$m^2$, UVB: 2 W/$m^2$)·Î 24½Ã°£ Á¶»çÇÏ¿´´Ù. À¯±â¹°ÀÇ È­ÇÐÀûÁ¶¼ºÀº XAD-8, ¾çÀÌ¿Â, À½À̿¼öÁö¸¦ ÀÌ¿ëÇÏ¿© ¼Ò¼ö¼º »ê (hydrophobic acids; HoA), ¼Ò¼ö¼º Áß¼º (hydrophobic neutrals;HoN), Ä£¼ö¼º »ê (hydrophilic acids; HiA), Ä£¼ö¼º ¿°±â (hydrophilic bases; HiB), ±×¸®°í Ä£¼ö¼º Áß¼º (hydrophilic neutrals; HiN)ÀÇ 5°³ ºÐȹÀ¸·Î ºÐ·ùÇÏ¿´´Ù. Àڿܼ±Ã³¸®µ¿¾È À¯±â¹°ÀÇ ³óµµº¯È­´Â °ÅÀÇ ¾ø¾ú´ø ¹Ý¸é »ýºÐÇØµµ´Â Àڿܼ±Ã³¸® Àü¿¡ ºñÇØ ÇöÀúÈ÷ °¨¼ÒÇÏ¿´´Ù(M. aeruginosa: 17%, O. agardhii: 28% °¨¼Ò). ¶ÇÇÑ Àڿܼ± ó¸® Àü°ú ÈÄÀÇ À¯±â¹°ÀÇ È­ÇÐÀûÁ¶¼ºµµ »ó´çÇÑ Â÷À̸¦ º¸¿´´Ù. Àڿܼ±Ã³¸® ÈÄ HiBºÐȹ(´Ü¹éÁú, ¾Æ¹Ì³ë»ê·ù)Àº °¨¼ÒÇÑ ¹Ý¸é HiAºÐȹ (Ä«º¹½Ç»ê·ù)Àº Áõ°¡ÇÏ¿´´Ù. À¯±â»êºÐ¼®¿¡¼­µµ 3Á¾·ùÀÇ Ä«º¹½Ç»êÀÌ Àڿܼ±Ã³¸® ÈÄ Áõ°¡ÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ÀϹÝÀûÀ¸·Î ¼öüÀÇ À¯±â¹°Àº Àڿܼ±¿¡ ÀÇÇØ ³­ºÐÇØ¼º À¯±â¹°ÀÌ ºÐÇØµÇ°Å³ª Àß°Ô Âɰ³Á® À̺ÐÇØ¼º À¯±â¹°·Î ÀüȯµÇ´Â °ÍÀ¸·Î ¾Ë·ÁÁ³´Ù. ±×·¯³ª º» ¿¬±¸¿¡¼­´Â Á¶·ù±â¿øÀÇ À̺ÐÇØ¼º À¯±â¹°ÀÇ °æ¿ì´Â Àڿܼ±¿¡ ÀÇÇØ ¿ÏÀüÇÑ ±¤ºÐÇØ´Â º¸ÀÌÁö ¾Ê¾ÒÁö¸¸ ³­ºÐÇØ¼º À¯±â¹°·Î ÀüȯµÇ¾ú°í È­ÇÐÀûÁ¶¼ºµµ ¹Ù²î¾ú´Ù. ÀÌ´Â À¯±â¹°ÀÇ ±â¿ø°ú Á¾·ù¿¡ µû¶ó Àڿܼ±¿¡ ´ëÇÑ ¿µÇâÀÌ ´Ù¸£´Ù´Â °ÍÀ» ½Ã»çÇÑ´Ù.0.73, P< 0.001). º» ¿¬±¸±â°£µ¿¾È µ¿¹°Çöûũſ ¼·½Ä¿¡ ÀÇÇÑ Ã»¼ö±â´Â °üÂûµÇÁö ¾Ê¾ÒÀ¸¸ç, µ¿ ${cdot}$ ½Ä¹°ÇöûũſÀÇ ´Ù¾ç¼ºÀº ½Ä¹°ÇöûũſÀÇ »ý¹°·® Áõ°¡ ½Ã ȸº¹µÇ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. º» ¿¬±¸°á°ú¿¡¼­´Â ºÎ¿µ¾ç È£¼ö¿¡¼­ µ¿¹°ÇöûũſÀÇ ¼·½ÄÀ̳ª Á¦ÇÑ¿µ¾ç¿°ÀÇ °áÇÌÀÌ ½Ä¹°ÇöûũſÀÇ ÇöÁ¸·®¿¡ ¿µÇâÀ» Ãâ ¼ö ÀÖÀ¸³ª ±ºÁýÀÇ º¯È­¸¦ ¾ß±âÇÏÁö´Â ¸øÇÔÀÌ Á¦½ÃµÇ¾ú´Ù.X>$NH_4;^+$, $NO_3;^-$, $PO_4;^{3-}$ ¹× $SiO_2$ÀÇ ¿ëÃâ·® ¹üÀ§´Â °¢°¢ -9${sim}$ 105 mgN $m^{-2}day^{-1}$, -156${sim}$62 $m^{-2}day^{-1}$ -5${sim}$5 $m^{-2}day^{-1}$, ¹× 12 ${sim}$ 117 $m^{-2}day^{-1}$¿´´Ù. ³«µ¿°­°ú ¼­³«µ¿°­¿¡¼­ ½Ä¹°ÇöûũſÀÇ 1Â÷ »ý»ê¼º°ú Á¶Ã¼ÀÇ C:N:PÀÇ Redfield ºñÀ² 106: 16: 1À» ÀÌ¿ëÇÏ¿© ÃßÁ¤ÇѰá°ú ÀúÁú¿¡¼­ ¿ëÃâµÇ´Â $NH_4;^+$´Â ½Ä¹°ÇöûũſÀÇ ¿ä±¸·®ÀÇ 9 ${sim}$23%À̾ú°í, $PO_4;^{3-}$´Â 11 ${sim}$ 22%¸¦ Â÷ÁöÇÏ¿´´Ù.µµ·Î °ËÃâµÇ¾î À̸¦ °í·ÁÇÑÁ¤¼ö°øÁ¤ÀÇ °ü¸®°¡ ÇÊ¿äÇϸ®¶ó »ý°¢µÈ´Ù.$yr^{-1}$)ÀÇ 71%°¡ °¨¼ÒµÇ¾î¾ß ÇÒ Çʿ伺ÀÌ Á¦±âµÇ¾ú´Ù. ¶ÇÇÑ ¿©¸§Ã¶ ½ÉÃþ »ê¼Ò °í°¥ÀÌ ¾ß±âµÇ¾ú°í, ÀÌ ½Ã±â¿¡ ÅðÀû¹°·Î ¿ëÃâµÈ ÀÎÀÌ ½Ä¹°Çöûũſ ¼ºÀå¿¡ ÀÌ¿ëµÉ ¼ö Àֱ⶧¹®¿¡ ÅðÀû¹°¿¡ ´ëÇÑ °ü¸®µµ ¼öÇàµÉ Çʿ䰡 ÀÖ´Ù
The effect of ultraviolet (UV) radiation on the characteristics of algae-derived dissolved organic matter (DOM) was examined by comparing the biodegradability and DOM fraction distribution of algal DOM before and after UV exposure. Algal DOM from two axenic cultures of Microcystis aeruginosa and Oscillatoria agardhii were irradiated for 24 h at a UV intensity of 42 W/$m^2$. A complete degradation of algal DOM during the UV exposure did not occur, remaining at constant concentrations of dissolved organic carbon(DOC). After UV exposure, however, microbial degradations were reduced by 17% in M. aeruginosa and 53% in O. agardhii, respectively, and decomposition rates also were two times lower in UV exposed algal DOM. In addition, the chemical compositions of algal DOM altered substantially after UV radiation exposure. The proportions of hydrophilic bases (HiB; protein-like DOM) decreased considerably in both algal DOM sources after UV exposure (16.8% and 20.0% of DOM, respectively), whereas those of hydrophilic acids (HiA; carboxylic acids-like DOM) increased as much as the decrease of the HiB fraction. Capillary ion electrophoresis (CE) analysis showed that several carboxylic acids increased significantly after UV exposure, further confirming an increase in HiA fractions. The results of this study clearly indicate that algal DOM can be changed in its chemical composition as well as biodegradability without complete degradation by UV radiation.
 
Ű¿öµå
algal DOM;UV effects;photoalteration;biodegradability;chemical composition;
 
Çѱ¹ÇÏõȣ¼öÇÐȸÁö / v.36, no.3, 2003³â, pp.235-241
Çѱ¹ÇÏõȣ¼öÇÐȸ
ISSN : 1976-8087
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200318317181519)
¾ð¾î : ¿µ¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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