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References
ISO 10694 : Soil quality - Determination of organic and total carbon after dry combustion (Elemental analysis);
ISO 13878 : Soil quality - Determination of total nitrogen content by dry combustion (Elemental analysis)
EN13654-2 : Soil improvers and growing media - Determination of nitrogen - Part 2: Dumas method
Gazzetta ufficiale Official Italian Method 248.1999
Tested with VELP Scientifica CN 802 Carbon Nitrogen Analyzer (Code F30800090)




Introduction

¾î´À ¹°ÁúÀÇ Åº¼Ò¿Í Áú¼ÒÀÇ ºñÀ² Áï C:N Ratio °¡ 24:1 À̶ó°í Çϸé ÀÌ´Â ±× ¹°ÁúÀº 24°³ÀÇ Åº¼Ò´ÜÀ§´ç 1°³ÀÇ Áú¼Ò ´ÜÀ§°¡ ÀÖ´Ù´Â °ÍÀ» ÀǹÌÇÑ´Ù. ÀÌ·¯ÇÑ C:N Ratio ´Â ½Ä¹°µî¿¡¼­ Nitrogen Limitation ÀÇ ÁöÇ¥·Î »ç¿ëµÉ Á¤µµ·Î ¸Å¿ì Áß¿äÇѵ¥ ¿¹¸¦ µé¾î ÀÌ ºñÀ²ÀÌ ³ôÀ¸¸é ¹°ÁúÀ» ºÐÇØÇϴµ¥ ´õ ¸¹Àº ½Ã°£ÀÌ ÇÊ¿äÇÏ°í ÀÌ ºñÀ²ÀÌ ³·À¸¸é ½Ä¹°ÀÇ ºÐÇØ ¼Óµµ°¡ ´õ ºü¸£°Ô ÀÏ¾î ³¯ °ÍÀÌ´Ù. ±×¸®°í Åä¾ç¼ÓÀÇ Áú¼ÒÀÇ ¾çÀº ½Ä¹°ÀÇ ¼ºÀå°ú ¾ÆÁÖ ¹ÐÁ¢ÇÑ ¿µÇâÀ» ¹ÌÄ¡°í ÀÖ´Ù.

Total Carbon (TC) Àº Total Organic Carbon (TOC) ¿Í Total Inorganic Carbon (TIC) ·Î ±¸¼ºµÇ¾îÀÖÀ¸¸ç Åä¾ç¿¡¼­ TOC ¼öÄ¡°¡ ³ôÀ¸¸é Çø±â¼ººÐÇØ°úÁ¤ÀÌ ÀúÇصǾî Åä¾ç¿¡¼­ Áú¼Ò¾çÀÇ Áõ°¡¸¦ ¾ïÁ¦ÇÏ°Ô µÈ´Ù.

VELP ´Â ½ÄÇ° ¾ÈÀü ¹× ȯ°æ °ü·Ã ºÐ¼® ½ÇÇè½ÇÀÇ Á¤È®¼º°ú ÀÏ°ü¼ºÀ» Æò°¡ÇÏ°í ºñ±³ÇÏ´Â µ¥ »ç¿ëµÇ´Â ³×´ú¶õµåÀÇ WEPAL (Wageningen Evaluating Programs for Analytical Laboratories) ÇÁ·Î±×·¥¿¡ µû¶ó CN 802 Carbon & Nitrogen Elemental Analyzer ¸¦ ÀÌ¿ëÇÏ¿© Åä¾ç »ùÇÃÀÇ C %, N % and TOC % ¸¦ ±¸ÇÑ´ÙÀ½ WEPAL °ª°ú ºñ±³ÇÏ¿© ÀåºñÀÇ Á¤¹Ðµµ¸¦ ºÐ¼®ÇÏ¿´´Ù.


Carbon, nitrogen and Total Carbon determination in soils and sediments

¨ç CN802 C. N ¿ø¼ÒºÐ¼®±â´Â ¸ÕÀú ½Ã·á¸¦ combustion (CF) ÇÏ¿© ½Ã·á¸¦ ¿¬¼Ò½ÃÅ°´Ù.
¨è ±× ´ÙÀ½ ´Ü°èÀÎ physical trap ÀÎ WT1-DriStep¢â ´Ü°è¿¡¼­ water ¸¦ Á¦°ÅÇÑ´Ù
¨é ±×¸®°í reduction furnace (RF) ´Ü°è¿¡¼­ Áú¼Ò»êÈ­¹° (NOx) ¸¦ Á¦°ÅÇÑ´Ù.
¨ê ´Ù½Ã µÎ¹ø° physical trap ÀÎ WT2-DriStep¢â ´Ü°è¿¡¼­ water ¸¦ ´Ù½ÃÇѹø ´õ Á¦°ÅÇÑ´Ù.
¨ë NDIR (Non-Dispersive Infrared NDIR Detector) ´Ü°è¿¡¼­ CO©ü ³óµµ¸¦ ÃøÁ¤ÇÏ°í ÀÌ ³óµµ ¼öÄ¡´Â Carbon ¾çÀ¸·Î °è»êµÇ¾îÁø´Ù.
¨ì ±×¸®°í ÀÌ ÀåÄ¡¿¡ ÇÔ²² ÀÖ´Â auto-regenerative CO©ü absorbers °¡ CO2 ¸¦ ¿ÏÀü Èí¼öÇÑ´Ù.
¨í ÃÖÁ¾ ´Ü°è¿¡¼­ LoGas¢â TCD (Thermal Conductivity Detector) °¡ Áú¼Ò ³óµµ¸¦ ÃøÁ¤ÇÑ´Ù.





Sample Preparation

Å×½ºÆ®¿¡ »ç¿ëµÇ´Â WEPAL ÀÇ reference soil and sediment »ùÇÃÀº ´ÙÀ½°ú °°´Ù.



¸ðµç »ùÇÃÀ» 105 ¡ÆC ¿¡¼­ °ÇÁ¶½ÃŲ ÈÄ °¢°¢ µÎ°³·Î ³ª´« ÈÄ ´ÙÀ½°ú °°Àº ¸ñÀûÀ¸·Î ºÐ¼®ÇÏ¿´´Ù.
- ¹Ù·Î CN 802 Àåºñ·Î ó¸®ÇÏ¿© Total Carbon °ú Total Nitrogen ÀÇ ¾çÀ» ÃøÁ¤
- ¸ÕÀú ½Ã·á¸¦ ¿°»ê (HCl) À¸·Î ó¸®ÇÏ¿© TIC (Total Inorganic Carbon) À» Á¦°ÅÇÑ ÈÄ CN 802 ¸¦ ÀÌ¿ëÇÏ¿© TOC (Total Organic Carbon) ¾çÀ» ÃøÁ¤


Analysis Procedure

´ÙÀ½°ú °°Àº Á¶°ÇÀ¸·Î TC, TN, TOC ¸¦ ÃøÁ¤ÇÏ¿´´Ù.
- Protein factor: none
- O2 flow rate: 300 ml/min
- O2 factor: 1.6 ml/mg
- ºÐ¼®½Ã°£ : from 3 minutes for one run


Typical C, N and TOC Results on sediment and soil samples

Carbon Calibration Àº Ç¥ÁØ Acetanilide (C% = 71) ¸¦ ÀÌ¿ëÇÏ¿© 0 - 35 mg C ÀÇ ¹üÀ§·Î ±¸ÇÏ¿´´Ù.

Nitrogen Calibration Àº : Ç¥ÁØ Aspartic Acid (C4H7NO4) ¸¦ ÀÌ¿ëÇÏ¿© 0 - 1.5 mg N ÀÇ ¹üÀ§·Î ±¸ÇÏ¿´´Ù.

calibration curve ´Â Standard UNI 15936 ÀÇ method B ¿¡ ÀÇ°ÅÇÏ¿© È®ÀÎÇÏ¿´À¸¸ç ¾Æ·¡ Å×À̺íÀº %C, %N and TOC °á°ú¸¦ º¸¿©ÁÖ°í ÀÖ´Ù.




Conclusion

WEPAL ÀÌ ÁÖ°üÇÏ´Â ¼º´ÉÆò°¡½ÃÇè¿¡¼­ CN 802 Carbon Nitrogen ¿ø¼ÒºÐ¼®±â´Â ¾ÆÁÖ ½Å·ÚÇÒ ¼ö ÀÖ´Â °á°ú¸¦ º¸¿©ÁÖ¾ú´Ù. soil °ú sediment ½Ã·áÀÇ TC(%C), TN(%N) ±×¸®°í TOC ÃøÁ¤¿¡¼­ CN 802 ´Â ¸Å¿ì Á¤¹ÐÇÏ°í ½Å¼ÓÇÏ°í ¶ÇÇÑ ½Å·ÚÇÒ ¼ö ÀÖ´Â °á°ú¸¦ º¸¿©ÁÖ¾úÀ¸¸ç WEPAL Àº ÀÌ ¸ðµç °á°ú¸¦ ÃÖÁ¾ÀûÀ¸·Î ÀÎÁõÇÏ¿´´Ù.


Main advantages of VELP Combustion analyzer

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CN 802 Carbon and Nitrogen Elemental Analysis







 
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