TY - JOUR
T1 - Method for rapid screening of pesticide mineralization in soil
AU - Rasmussen, Jim
AU - Jensen, Pia Haugaard
AU - Holm, Peter E.
AU - Jacobsen, Ole Stig
PY - 2004/5
Y1 - 2004/5
N2 - A method has been developed for the analysis of
14CO
2 evolution from the mineralization of
14C-labelled organic compounds in soil samples. The new method is less space demanding and substantially cuts down laborious manual work compared to the traditional incubation bottle method used. Furthermore, the use of scintillation cocktail is largely reduced with the new method. In the new method,
14CO
2 is trapped in filter paper held in the lid of a 20 ml glass vial by surface tension. The trapping solution used is Ca(OH)
2, which fixates CO
2 in the filter paper and the analysis of trapped
14CO
2 is done using the Cyclone™ Storage Phosphor system. The lids are placed in a 32 well holder and exposed to a phosphor screen prior to scanning in a Cyclone™ scanner. The new filter method has been tested and compared to results obtained using the traditional method. The results show good agreement but due to a smaller capacity for CO
2 with the filter method compared to the traditional method, the interval between sampling has to be shorter using the filter method when the CO
2 development is high. The detection limits for the filter method is higher compared to the traditional method. With the filter method, the level of radioactivity has to exceed 300 dpm before detection is possible, while the same limit for the traditional method is around 30 dpm. On the other hand, the gas trapping faster and the efficiency is higher with the filter method.
AB - A method has been developed for the analysis of
14CO
2 evolution from the mineralization of
14C-labelled organic compounds in soil samples. The new method is less space demanding and substantially cuts down laborious manual work compared to the traditional incubation bottle method used. Furthermore, the use of scintillation cocktail is largely reduced with the new method. In the new method,
14CO
2 is trapped in filter paper held in the lid of a 20 ml glass vial by surface tension. The trapping solution used is Ca(OH)
2, which fixates CO
2 in the filter paper and the analysis of trapped
14CO
2 is done using the Cyclone™ Storage Phosphor system. The lids are placed in a 32 well holder and exposed to a phosphor screen prior to scanning in a Cyclone™ scanner. The new filter method has been tested and compared to results obtained using the traditional method. The results show good agreement but due to a smaller capacity for CO
2 with the filter method compared to the traditional method, the interval between sampling has to be shorter using the filter method when the CO
2 development is high. The detection limits for the filter method is higher compared to the traditional method. With the filter method, the level of radioactivity has to exceed 300 dpm before detection is possible, while the same limit for the traditional method is around 30 dpm. On the other hand, the gas trapping faster and the efficiency is higher with the filter method.
KW - C14-labelled
KW - Limit of detection
KW - Phosphor screen technique
UR - http://www.scopus.com/inward/record.url?scp=1842562326&partnerID=8YFLogxK
U2 - 10.1016/j.mimet.2003.12.004
DO - 10.1016/j.mimet.2003.12.004
M3 - Article
SN - 0167-7012
VL - 57
SP - 151
EP - 156
JO - Journal of Microbiological Methods
JF - Journal of Microbiological Methods
IS - 2
ER -