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ÀÛ¼ºÀÚ : °ü¸®ÀÚ( )   ÀÛ¼ºÀÏ : 2018.08.16   Á¶È¸¼ö : 4720

"Æ÷Åä(±¤) ÇöóÁ ¿ø¸®" vs "±¤Ã˸Š¿ø¸®"¸¦ »óÈ£ ºñ±³ÇÏ¿© °ø±â»ì±Õ, Å»Ãë, À¯Çع°Áú Æı« µîÀÇ °ø±âÁ¤È­ ¿ø¸®¸¦ ¾Æ·¡¿Í °°ÀÌ ±¸Ã¼ÀûÀ¸·Î Çؼ³ÇÏ¿© °øÁöÇÕ´Ï´Ù!

 

ÃÖ±Ù ±¹³»¿¡¼­ ´Ù¼öÀÇ °ø±â»ì±Õ±â °ü·Ã¾÷üµéÀÌ "¼ö»ê±â(ÇÏÀ̵å·Ï½Ç ¶óµðÄ®)"¸¦ ¹ß»ý½ÃŲ´Ù°í ÁÖÀåÇϸ鼭 ´ç»çÀÇ ±â¼úÀڷḦ ÆÛ´Ù°¡ ÀοëÇÏ°í ÀÖ½À´Ï´Ù.

ÀÌ·¯ÇÑ °ú´ë °úÀ層°í¿¡ ´ëÇØ °æ°íÇÏ´Â Â÷¿ø¿¡¼­ "¼ö»ê±â(OH.)"¿¡ ´ëÇØ ºÎ¿¬ÇÏ¿© ¼³¸íµå¸³´Ï´Ù. 

¼ö»ê±â(OH.)´Â ±¤Ã˸Å(TiO2) ÇÊÅÍ¿Í Àڿܼ±(UVA) ÆÄÀåÀÌ °áÇյǾúÀ»¶§ ¹ß»ýÇÏ´Â °ÍÀÌ ¾Æ´Õ´Ï´Ù. ¶ÇÇÑ ¼ö»ê±â(OH.)°¡ ¹ß»ýÇÏ¿© ½Ç³»°ø±â ÁßÀ¸·Î µÕµÕ ¶°´Ù´Ï¸ç ¹ÝÀÀÇÏ´Â °Íµµ Àý´ë ¾Æ´Õ´Ï´Ù.

±¤Ã˸ſ¡¼­´Â "¼ö»êÈ­¾Æ´Ï¿Â(OH-)"ÀÌ Àڿܼ± ±¤ÀÌ ÂÉÀ϶§, ±¤Ã˸Šǥ¸é(Surface)¿¡¼­ "¼ö¾ïºÐÀÇ 1ÃÊ~¼ö¹é¸¸ºÐÀÇ 1ÃÊ"¶ó´Â »ó»óÇÒ¼ö ¾ø´Â ±Ø´ÜÀû Âû³ª¿¡ ³ªÅ¸³ª ±×ÀÚ¸®¿¡¼­ ¹ÝÀÀÇÏ°í ±×Áï½Ã »ç¶óÁý´Ï´Ù. µû¶ó¼­, ±¤Ã˸Šǥ¸é¿¡¼­ Âû³ªÀûÀ¸·Î ³ªÅ¸³ª ±¤Ã˸Šǥ¸é ±×ÀÚ¸®¿¡¼­ Áï½Ã »ç¶óÁö´Â ¼ö»êÈ­ÀÌ¿Â(OH-) ¶ÇÇÑ °ø±â ÁßÀ¸·Î ³¯¾Æ´Ù´Ï¸ç ¼¼±Õ°ú À¯Çع°ÁúÀ» ¸¸³ª Æı«ÇÏ°í »ç¶óÁö´Â °ÍÀÌ Àý´ë ¾Æ´Õ´Ï´Ù.


ÀÌ·¯ÇÑ ¹«Áö´Â ±¤Ã˸ŠÀ̷п¡ ÇØ´ç±â¾÷ÀÌ ¹«ÁöÇϰųª ¿ì¸®»çȸ °úÇа谡 ½ÇÁõÇÏÁö ¸øÇÑ´Ù´Â »ç½ÇÀ» ¾Ç¿ëÇÏ´Â ±â¸¸»ó¼úÀÔ´Ï´Ù.

¾ðÁ¨°¡´Â ÀÌ·¯ÇÑ °ú´ë °úÀ層°í¿¡ ´ëÇØ Á¤ºÎÂ÷¿ø¿¡¼­ »óÀÀÇÏ´Â ÀÀ¡ÀÌ µû¶ó¾ß ÇÒ °ÍÀÔ´Ï´Ù. 

¼ö»ê±âÀÇ ¹ß°ß°ú È°¿ëÀº ¹Ì°úÇа谡 ¹àÇô³½ °ÍÀ¸·Î ¹ÌÇ×°ø¿ìÁÖ±¹ÀÇ ¿¬±¸¿¡ ÀÇÇÑ °ÍÀÔ´Ï´Ù.

±×·¯ÇÑ »ç½Ç°ú Áõ°Å´Â ¹Ì°úÇа谡 ¿À·¡ÀüºÎÅÍ È®º¸ÇÏ°í ÀÖ½À´Ï´Ù.

À¯°¨½º·´°Ôµµ ±¹³» Áß¼Ò±â¾÷µéÀÌ ÀÌ·¯ÇÑ »ç½ÇÀ» Àß ¸ð¸¥Ã¤, ¼ö»ê±â(OH.)¿¡ ´ëÇØ ´ç»ç°¡ ¿À·¡ Àü¿¡ ±¹³» ÀÎÅÍ³Ý ¸Åü¿¡ ¿Ã¸° ±â¼ú¼³¸í ÀڷḦ ÆÛ´Ù°¡ ¸¶Ä¡ ÀڽŵéÀÌ ±×·¯ÇÑ ±â¼úÀ» ã¾Æ³Â°í, ¹ß°ßÇÏ¿© »õ·Î¿î ±â¼ú·Î Æ÷ÀåÇÏ°í, °ú´ë °úÀ層°í¸¦ ÇÏ°í ÀÖ½À´Ï´Ù. 

µû¶ó¼­, ÀÌ·¯ÇÑ ±â¸¸»ó¼úÀ» ¼ÓÈ÷ ±ú´Ý°í »ç¾÷»ó ÇÇÇØ°¡ ¾ø±â¸¦ Áø½ÉÀ¸·Î ´çºÎµå¸³´Ï´Ù!        

   

¼ö»ê±â (•OH)´Â ¼ö»êÈ­ÀÌ¿Â (OH-)ÀÇ Áß¼º ÇüÅÂÀÔ´Ï´Ù. ¼ö»ê±â´Â ¹ÝÀÀ¼ºÀÌ ¸Å¿ì ³ôÀ¸¸ç, °á°úÀûÀ¸·Î ¼ö»ê±âÀ̱⠶§¹®¿¡ ±× ¼ö¸íÀÌ ¸Å¿ì ª½À´Ï´Ù. °¡Àå ´«¿¡ ¶ç´Â ¼ö»êÈ­¹°(ROH)Àº ¼ö»êÈ­¹°(ROH)ÀÇ ÀÚ±âºÐÇØ ¶Ç´Â ´ë±âÈ­Çп¡¼­ ¹° (H2O)°ú ÇÔ²² ÈïºÐµÈ »ê¼Ò¿øÀÚ (O) Áï, ¿ÀÁ¸(O3)¿¡¼­ ¶³¾îÁ® ³ª¿Â ÀÏÁßÇ×»ê¼Ò (O)¿ÍÀÇ ¹ÝÀÀ¿¡ ÀÇÇØ »ý¼ºµË´Ï´Ù. ¶ÇÇÑ ¹æ»ç´É ȯ°æ¿¡ ³ëÃâµÇ´Â ³Ã°¢¼ö ½Ã½ºÅÛ¿¡¼­ ±× ºÎ½ÄÀ» °³¼±ÇÏ°í, °ú»êÈ­¼ö¼Ò (H2O2, HO2) ¹× »ê¼Ò (O2)ÀÇ Çü¼ºÀ» À¯µµÇϱ⠶§¹®¿¡ ¹æ»ç¼± È­Çп¡¼­ ¸Å¿ì Áß¿äÇÑ ¿ä¼ÒÀÔ´Ï´Ù. ¶ÇÇÑ ¼ö»ê±â (•OH)´Â °ú»êÈ­¼ö¼Ò (H2O2)ÀÇ Àڿܼ± Â÷´Ü (UV-Light disocation) °úÁ¤¿¡¼­ »ý¼ºµÇ¸ç, ÆæÅæ (Fenton) È­Çп¡¼­ Áß¿äÇÑ ¹°ÁúÀÔ´Ï´Ù.

À¯±â¹°ÀÇ ÇÕ¼º¿¡¼­ ¼ö»ê±â´Â "1¼ö»êÈ­-2(1H)-ÇǸ®µð´Ñ¿¡Æ¼¿Â"ÀÇ ±¤ºÐÇØ °úÁ¤¿¡¼­ °¡Àå ÀϹÝÀûÀ¸·Î ¹ß»ýÇÕ´Ï´Ù. ¼ö»ê±â´Â ¼ö¸¹Àº ¿À¿°¹°Áú°ú ¹ÝÀÀÇÏ¿© "±Õ¿­"À» ÅëÇØ ºÐÇØÇϱ⠶§¹®¿¡ ´ë·ù±ÇÀÇ "û¼ÒÀÚ"·Î ºÒ¸®±âµµ ÇÕ´Ï´Ù.

¼ö»ê±â´Â ¶ÇÇÑ ¸Þź (CH4)°ú ¿ÀÁ¸ (O3)°ú °°Àº ÀϺΠ¿Â½Ç°¡½º¸¦ Á¦°ÅÇϴµ¥ Áß¿äÇÑ ¿ªÇÒÀ» ÇÕ´Ï´Ù. ¼ö»ê±â (hydroxyl Radical)ÀÇ ¹ÝÀÀ¼Óµµ´Â ±¤ºÐÇØ°¡ ÀϾÁö ¾Ê°Å³ª, ºø¹°ÀÌ ¶³¾îÁö´Â °æ¿ì³ª, ´ë±â Áß¿¡ ¾ó¸¶³ª ¸¹Àº ·®ÀÇ ¿À¿°¹°ÁúÀÌ ºÐÇصÇÁö ¾Ê°í Áö¼ÓµÇ´ÂÁö¸¦ °áÁ¤ÇÏ´Â ÀÏÁ¾ÀÇ Àã´ë°¡ µË´Ï´Ù.


¿¹¸¦ µé¾î, ¼ö»ê±â¿Í ºñ±³Àû ´À¸®°Ô ¹ÝÀÀÇÏ´Â ¸Þź (CH4)Àº Æò±Õ¼ö¸íÀº 5³â ÀÌ»óÀÌ°í,  CFC (ÇÁ·¹¿Â °¡½ºÃ¼)ÀÇ ¼ö¸íÀº 50³â ÀÌ»óÀÔ´Ï´Ù. ÃÑźȭ¼ö¼Ò (THC)¿Í °°Àº ´Ù¸¥ ¿À¿°¹°ÁúÀº ¸î½Ã°£ À̳»¶ó´Â ¸Å¿ì ªÀº Æò±Õ¼ö¸íÀ» º¸ÀÔ´Ï´Ù. µû¶ó¼­ ÀÌ·¯ÇÑ ´ë±â Áß ¿À¿°¹°ÁúÀÇ Æò±Õ¼ö¸íÀ» ´ÜÃà½ÃÅ°´Â ¿ªÈ°·Î¼­ ¼ö»ê±âÀÇ ¿ªÈ°Àº »óÈ£ºñ±³ ´ë»ó¹°ÁúÀÔ´Ï´Ù. 

¼ö»ê±â´Â Èֹ߼ºÀ¯±âÈ­ÇÕ¹° (VOCs)¿¡ ´ëÇÑ Ã¹¹ø° ¹ÝÀÀ¿¡¼­ ¹° (H2O)°ú ¾Ëų(R•)À» Çü¼ºÇϵµ·Ï ¼ö¼Ò¿øÀÚ (H)¸¦ »©¾Ñ¾Æ Á¦°ÅÇÏ´Â ¿ªÈ°À» ¼öÇàÇÕ´Ï´Ù.


•OH + RH ¡æ H2O + R •


¾Ëų°è´Â ÀüÇüÀûÀ¸·Î »ê¼Ò°¡ Á¸ÀçÇÒ¶§, °ú»êÈ­¹°À» Çü¼ºÇϸ鼭 ºü¸£°Ô ¹ÝÀÀÇÕ´Ï´Ù.


R • + O2 ¡æ RO•


´ë·ù±Ç¿¡¼­ ¼ö»ê±âÀÇ ¿î¸íÀº žçºû ±¤ÀÚ·®, ´ë±â ÁßÀÇ ¿À¿°·® ±×¸®°í ¾Ëų°è È­ÇÕ¹°ÀÇ ¼ºÁú°ú °°Àº ¿äÀο¡ ´Þ·Á ÀÖ½À´Ï´Ù.



°á·Ð: ¼ö»ê±â´Â ¼ºÃþ±Ç ¿ÀÁ¸Ãþ ¹Ù·Î ¾Æ·¡¿¡ »ó´ç·®ÀÌ Á¸ÀçÇÏ´Â °ÍÀ¸·Î ¹ÌÇ×°ø¿ìÁÖ±¹¿¡ ÀÇÇØ ÃÖÃÊ·Î ¹àÇôÁ³½À´Ï´Ù.

¼ö»ê±â´Â ¿ÀÁ¸Ãþ Æı«¸¦ Áö¿¬½ÃŲ ¹°Áú·Î µÚ´Ê°Ô ¾Ë·ÁÁ³½À´Ï´Ù.

¼ö»ê±â´Â ´ë·ù±Ç¿¡¼­´Â ´ë±â¿À¿° ¹°ÁúÀ» ž籤ÀÌ ±¤ºÐÇØ (Photolysis)ÇÏ´Â °úÁ¤¿¡¼­ 2Â÷·Î ³ªÅ¸³­ Èļӹ°Áú ¿ÀÁ¸ (O3)¿¡¼­ ¶³¾îÁ® ³ª¿Â »ê¼Ò¿øÀÚ (O)°¡ ÁÖº¯ ½À±âÀÎ ¹°(H2O)°ú ¹ÝÀÀÇÏ¿© ¸ÕÀú °ú»êÈ­¼ö¼Ò (H2O2)·Î ¸¸µé¾î Áý´Ï´Ù.  °ú»êÈ­¼ö¼Ò´Â ´Ù½Ã ž籤¿¡ ÀÇÇØ ±¤ºÐÇصǾî 2°³ÀÇ ¼ö»ê±â(OH.)·Î »ý¼ºµÇ°í Âû³ªÀûÀ¸·Î ¿À¿°¹°Áú°ú ¹ÝÀÀÇÏ°í »ç¶óÁö´Â 3Â÷ ¹ÝÀÀ¹°ÁúÀÔ´Ï´Ù.


¿À´Ã³¯ ¿ì¸®°¡ ±¤À¸·Î ÇöóÁ¸¦ ÀÏÀ¸ÄÑ °ø±â ÁßÀÇ »ê¼Ò(O2)¸¦ ±¤ºÐÇØÇÏ°í, ¿ÀÁ¸¿¡¼­ ¶³¾îÁ® ³ª¿Â »ê¼Ò¿øÀÚ (O)°¡ ½À±â¿Í ¹ÝÀÀÇÏ¿© °ú»êÈ­¼ö¼Ò (H2O2)·Î ³ªÅ¸³ª°í, ´Ù½Ã °ú»êÈ­¼ö¼Ò°¡ ±¤ºÐÇصǾî 2°³ÀÇ ¼ö»ê±â (OH.)·Î ³ªÅ¸³ª´Â °ÍÀÌ ¹Ù·Î ÀÌ·¯ÇÑ ±âº»¿ø¸®¸¦ ÀÌ¿ëÇÏ´Â °ÍÀÔ´Ï´Ù.

´Ù½Ã ¸»Çϸé, ƯÁ¤ ÀåÄ¡¿¡¼­ °­·ÂÇÑ ±¤ÆÄÀåÀÇ Áø°øÀڿܼ± (VUV)ÀÌ ¾ø°í, »ê¼Ò(O2)¸¦ ±¤ºÐÇØÇÏ¿© ¿ÀÁ¸ (O3)À» ¸¸µé¼ö  ¾øÀ¸¸é ¼ö»ê±â (OH.)´Â °áÄÚ ³ªÅ¸³ªÁö ¾Ê´Â °Ì´Ï´Ù.

¹«¿ÀÁ¸ (Ozoneless) »óŶó°í ÁÖÀåÇÏ°í, ÇöóÁ (Plasma)µµ ¾ø´Âµ¥, ¸¶Ä¡ ¼ö»ê±â (OH.)°¡ ³ªÅ¸³ª °ø±â ÁßÀ¸·Î ³¯¾Æ´Ù´Ï¸ç »ì±ÕÇÏ°í Æı«ÇÑ´Ù´Â ÁÖÀåÀº »çȸ¸¦ ±â¸¸ÇÏ´Â °ÍÀÓÀ» ºÐ¸íÈ÷ ¹àÇôµÓ´Ï´Ù!      


           

The hydroxyl •OH radical is one of the main chemical species controlling the oxidizing capacity of the global Earth atmosphere.

This oxidizing reactive species has a major impact on the concentrations and distribution of greenhouse gases and pollutants in the Earth atmosphere. It is the most widespread oxidizer in the

troposphere, the lowest part of the atmosphere.

Understanding •OH variability is important to evaluating human impacts on the atmosphere and climate.

The •OH species has a lifetime in the Earth atmosphere of less than one second.[10]

Understanding the role of •OH in the oxidation process of methane (CH4) present in the atmosphere to first carbon monoxide (CO) and then carbon dioxide (CO2) is important for assessing the residence time of this greenhouse gas, the overall carbon budget of the troposphere, and its influence on the process of global warming. The lifetime of •OH radicals in the Earth atmosphere is very short, therefore •OH concentrations in the air are very low and very sensitive techniques are required for its direct detection.[11]

Global average hydroxyl radical concentrations have been measured indirectly by analyzing methyl chloroform (CH3CCl3) present in the air. The results obtained by Montzka et al. (2011)[12] shows that the interannual variability in •OH estimated from CH3CCl3 measurements is small, indicating that global •OH is generally well buffered against perturbations.

This small variability is consistent with measurements of methane and other trace gases primarily oxidized by •OH, as well as global photochemical model calculations.

In 2014, researchers reported their discovery of a "hole" or absence of hydroxyl throughout the entire depth of the troposphere across a large region of the tropical West Pacific.

They suggested that this hole is permitting large quantities of ozone-degrading chemicals to reach the stratosphere, and that this may be significantly reinforcing ozone depletion in the polar regions with potential consequences for the climate of the Earth.[13]   



 


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