Oh Seok-Young, Chiu Pei C, Cha Daniel K
Department of Civil and Environmental Engineering, University of Ulsan, Ulsan 680-749, South Korea.
J Hazard Mater. 2008 Oct 30;158(2-3):652-5. doi: 10.1016/j.jhazmat.2008.01.078. Epub 2008 Feb 2.
Reductive transformation of 2,4,6-trinitrotoluene (TNT), hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), and nitroglycerin (NG) by pyrite (FeS(2)) and magnetite (Fe(3)O(4)) was investigated to determine the role of Fe(II)-bearing minerals on the fate of toxic explosives in Fe/S-rich natural environment. Results from batch experiments showed that 65% of TNT and 45% of RDX were transformed from solution in the presence of pyrite under pH 7.4 buffered conditions within 32 days. Without a buffered solution, transformation of TNT and RDX decreased. NG was continuously and rapidly transformed by pyrite under both conditions. Complete removal of NG was achieved in 32 days under buffered conditions. NH(4)(+) was identified as a reduction product for RDX and NG in the pyrite-water system. Reductive transformation of RDX and NG by magnetite was slower than that by pyrite. The results suggest that abiotic transformation of the explosives by pyrite and magnetite may be considered when determining the fate of explosives in Fe/S-rich subsurface environments.
研究了黄铁矿（FeS₂）和磁铁矿（Fe₃O₄）对2,4,6-三硝基甲苯（TNT）、六氢-1,3,5-三硝基-1,3,5-三嗪（RDX）和硝化甘油（NG）的还原转化作用，以确定富含铁/硫的自然环境中含铁（II）矿物对有毒炸药归宿的影响。批次实验结果表明，在pH 7.4缓冲条件下，32天内黄铁矿存在时，65%的TNT和45%的RDX从溶液中转化。没有缓冲溶液时，TNT和RDX的转化减少。在两种条件下，NG都被黄铁矿持续快速转化。在缓冲条件下，32天内NG完全去除。NH₄⁺被确定为黄铁矿-水体系中RDX和NG的还原产物。磁铁矿对RDX和NG的还原转化比黄铁矿慢。结果表明，在确定富含铁/硫的地下环境中炸药的归宿时，可能需要考虑黄铁矿和磁铁矿对炸药的非生物转化作用。
