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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

ź¼Ò:Áú¼Ò ºñÀ² (carbon-to-nitrogen ratio, C:N ratio) Àº ÀÜ·ù¹° ºÐÇØ (residue decomposition) ¿Í Åä¾çÀÇ Áú¼Ò ¼øȯ (nitrogen cycling in soils) ¿¡ Á÷Á¢ÀûÀÎ ¿µÇâÀ» ¹ÌÄ¡´Â º¯¼ö·Î½á ¸Å¿ì Áß¿äÇÏ´Ù. ½Ä¹°°ú ¹Ì»ý¹°ÀÇ Áú¼Ò Á¦ÇÑ¿¡ ´ëÇÑ ÁöÇ¥·Î »ç¿ëµÇ±â ¶§¹®ÀÌ´Ù. ÀϹÝÀûÀ¸·Î ÀÌ ºñÀ²ÀÌ ³ôÀ»¼ö·Ï ¹°ÁúÀÌ ºÐÇصǴµ¥ ½Ã°£ÀÌ ¿À·¡ °É¸®±â ¶§¹®ÀÌ´Ù. ¹Ý´ë·Î ÀÌ ºñÀ²ÀÌ ³·À»¼ö·Ï ¹°Áú, ƯÈ÷ ½Ä¹°ÀÌ ´õ »¡¸® ºÐÇص˴ϴÙ. ÀÌ·¯ÇÑ ¸ÞÄ¿´ÏÁòÀº ´ÙÀ½¿¡ ÀÚ¶ó´Â ½Ä¹°ÀÌ »ç¿ëÇÒ ¼ö ÀÖ´Â Åä¾ç ³» Áú¼Ò·®°ú Á÷Á¢ÀûÀÎ °ü°è°¡ ÀÖ´Ù.

VELP»ç ¿ø¼Ò¼ººÐºÐ¼®±â CN 802 ¸¦ ÀÌ¿ëÇÏ¿© Åä¾ç »ùÇÃÀ» ºÐ¼®ÇÏ°í ¾òÀº °á°ú¸¦ WEPAL (Wageningen Evaluating Programs for Analytical Laboratories) ¿¡¼­ Çã¿ëÇÏ´Â Åë°è ¹üÀ§¿Í ºñ±³ÇÏ¿© ÇØ´ç ÀåºñÀÇ ÃøÁ¤ Á¤È®µµ¸¦ ºÐ¼®ÇÏ¿´´Ù. À̸¦ ÅëÇØ ÇØ´ç ÀåºñÀÇ ¼º´ÉÀº WEPAL ¿¡¼­ ÁÖ°üÇÏ´Â ¼÷·ÃµÈ Å×½ºÆ® ÇÁ·Î±×·¥ (the Proficiency Testing program) ¿¡ ÀÇÇØ Æò°¡µÇ¾ú´Ù.

Carbon and Nitrogen Determination in Soils

¨ç CN802 C. N ¿ø¼ÒºÐ¼®±â´Â ¸ÕÀú ½Ã·á¸¦ combustion (CF) ÇÏ¿© ½Ã·á¸¦ ¿¬¼ÒÇÑ´Ù.½ÃÅ°´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.




CN 802 Preliminary Operations (daily)

¾Æ·¡ ÃøÁ¤ Á¶°Ç°ú °°ÀÌ Åä¾ç ³» ź¼Ò ¹× Áú¼ÒÀÇ ÇÔ·®À» ÃøÁ¤ÇÏ¿´´Ù
¡Ü Temperature Combustion reactor (Code A00000158) : 1030 ¡ÆC
¡Ü Temperature Reduction reactor (Code A00000226) : 650 ¡ÆC
¡Ü Flow rate MFC1 He : 190 ml/min
¡Ü Flow rate MFC2 He : 220 ml/min
¡Ü calibration ¿ë Ç¥ÁØ »ùÇà : 2 EDTA standard (Code A00000149)
¡Ü CHECK UP »ùÇÃ : 3 to 5 empty tin foils (Code A00000153)
Ç¥ÁØ »ùÇÃÀ» ÀÌ¿ëÇÏ¿© Calibration Curve ¸¦ »ý¼ºÇÏ¿© ÃøÁ¤ ¹× ºÐ¼®¿¡ »ç¿ëÇÏ¿´´Ù.

Sample Preparation

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

Reference Samples : Expected Values on Dry Matter :
Wepal ISE 2018-4 Sediment sample 860 C % = 4.524 ¡¾ 0.207
N % = 0.1628 ¡¾ 0.0132
Wepal ISE 2018-4 Clay sample 879 C % = 2.911 ¡¾ 0.072
N % = 0.1688 ¡¾ 0.0126
Wepal ISE 2018-4 Sandy soil sample 919 C % = 2.586 ¡¾ 0.207
N % = 0.1487 ¡¾ 0.0142
Wepal ISE 2018-4 Sandy soil sample 993 C % = 2.624 ¡¾ 0.119
N % = 0.2361 ¡¾ 0.0117

Åä¾ç »ùÇÃÀº ºÐ¼® Àü¿¡ 105¡ÆC¿¡¼­ °ÇÁ¶µÇ¾úÀ¸¸ç spatula ·Î 300mgÀÇ »ùÇÃÀ» È£ÀÏ¿¡ ³Ö´Â´Ù. ±×¸®°í È£ÀÏÀ» ´Ý¾Æ ĸ½¶Ã³·³ ¸¸µç ´ÙÀ½ Àåºñ »óºÎ¿¡ À§Ä¡ÇÑ autosampler ¿¡ ³Ö´Â´Ù.

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 and N Results on Soil samples

ź¼Ò ÃøÁ¤ °á°ú´Â 0 - 20 mg C ¹üÀ§¿¡¼­ standard CaCO3(C% = 12)¸¦ »ç¿ëÇÏ¿© »ý¼ºÇÑ Calibration Curve ¸¦ ±âÁØÀ¸·Î ºÐ¼®ÇÏ¿´´Ù. Áú¼Ò ÃøÁ¤ °á°ú´Â 0 - 1.5 mg N ¹üÀ§¿¡¼­ ¾Æ½ºÆĸ£Æ®»ê (aspartic acid, C4H7NO4) ¸¦ »ç¿ëÇÏ¿© »ý¼ºÇÑ Calibration Curve ¸¦ ±âÁØÀ¸·Î ºÐ¼®ÇÏ¿´´Ù. ÀÌ·¯ÇÑ ÃøÁ¤ °á°ú´Â certificate of analysis ¿¡¼­ Çã¿ëÇÏ´Â ¿ÀÂ÷ ¹üÀ§¿¡ Æ÷ÇԵǾú´Ù.

4°³ÀÇ WEPAL Á¦°ø »ùÇà ¸ðµÎ CN 802ÀÇ ¹Ýº¹¼ºÀ» Æò°¡Çϱâ À§ÇØ 10ȸ¾¿ ¹Ýº¹ ÃøÁ¤ÇÏ¿´À¸¸ç ±× °á°ú´Â ¾Æ·¡Ç¥¿¡ ³ªÅ¸³»¾ú´Ù. ¼ÒÇÁÆ®¿þ¾î CNSoft ´Â ratio C:N ¸¦ ÀÚµ¿À¸·Î °è»êÇϸç ÀÌ ¶ÇÇÑ Ç¥¿¡ ±â·ÏÇÏ¿´´Ù.



Conclusion

VELP Scientifica CN 802 ź¼Ò Áú¼Ò ºÐ¼®±â´Â Åä¾ç ½Ã·áÀÇ Åº¼Ò¿Í Áú¼Ò ¹× C:N ºñÀ² ÃøÁ¤À» À§ÇÑ ÀÌ»óÀûÀÎ ¼Ö·ç¼ÇÀÌ´Ù. ºÐ¼®±â´Â ¼ÒÇÁÆ®¿þ¾î CNSoft ¿¡ ÀÇÇÑ ÀÚµ¿ °è»êÀ¸·Î ½±°í ºü¸¥ ¹æ¹ýÀ¸·Î ½Å·ÚÇÒ ¼ö ÀÖ´Â °á°ú¸¦ º¸ÀåÇÑ´Ù.

À§ Ç¥¿¡¼­ ³ªÅ¸³½ ¹Ù¿Í °°ÀÌ ºÐ¼® °á°ú´Â ¸ðµÎ CN 802 ºÐ¼®±âÀÇ ¶Ù¾î³­ ¹Ýº¹¼º°ú Á¤È®¼ºÀ» º¸¿©ÁÖ°í ÀÖ´Ù. ³ôÀº »ý»ê¼º°ú ³í½ºÅé ¼º´ÉÀ» °®Ãá CN 802 ¿¬¼Ò ÀåÄ¡´Â ³ôÀº 󸮷®¿¡ ÀÌ»óÀûÀÌ¸ç ¿ÏÀü ÀÚµ¿È­µÇ¾î ÀÖ°í ºÐ¼®´ç 2-5ºÐÀÌ ¼Ò¿äµÇ¾î ºü¸¥ ½ÇÇèÀ» º¸ÀåÇÑ´Ù.

Main advantages of VELP Combustion analyzer

¡Ü ½Ã·á´ç 3-4ºÐÀÇ ¸Å¿ì ½Å¼ÓÇÑ ºÐ¼®½Ã°£
¡Ü Áú¼Ò 0.001mg ±îÁö ÃøÁ¤ÇÒ ¼ö ÀÖ´Â ÃÊÁ¤¹Ð ÃøÁ¤´É·Â°ú 0.5% (EDTA) º¸´Ù ÈξÀ ³·Àº »ó´ëÇ¥ÁØÆíÂ÷¸¦ º¸À̴ Ź¿ùÇÑ ÀçÇö¼º
¡Ü Çõ½ÅÀû ±â¼ú°ú Á¤Ç°¼Ò¸ðÇ° Áö¿ø¿¡ ÀÇÇÑ ¸Å¿ì ³·Àº ½Ã·á´ç ÃøÁ¤ ºñ¿ë
¡Ü ¸Å¿ì ½±°í ºü¸¥ Àåºñ ¼³Ä¡
¡Ü ´©±¸³ª ¼Õ½±°Ô ÇÒ ¼ö ÀÖ´Â Àåºñ À¯Áö º¸¼ö
¡Ü ´©±¸³ª ½±°Ô »ç¿ëÇÒ ¼ö ÀÖµµ·Ï ¼³°èµÈ User Interface



CN 802 Carbon and Nitrogen Elemental Analysis







 
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