Bojanowska-Czajka Anna, Drzewicz Przemysław, Kozyra Czesław, Nałecz-Jawecki Grzegorz, Sawicki Józef, Szostek Bogdan, Trojanowicz Marek
Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland.
Ecotoxicol Environ Saf. 2006 Oct;65(2):265-77. doi: 10.1016/j.ecoenv.2005.07.015. Epub 2005 Oct 5.
Reversed-phase HPLC determination of the herbicide MCPA and its products of radiolytic degradation has been optimized. The radiolytic degradation was carried out using gamma-irradiation and was optimized in terms of irradiation dose and pH of irradiated MCPA solution. Decomposition of 100 ppm MCPA in pure solutions required irradiation with a 3 kGy dose. The main products of irradiation in the dose range up to 10-kGy were various phenolic compounds and carboxylic acids. The developed method was applied for treatment of industrial waste from production of MCPA. The 10-kGy dose was needed for decomposition of 500 ppm of MCPA in the industrial waste samples; however, the presence of stoichiometric amount of hydrogen peroxide in the irradiated waste allowed a 50% reduction of the gamma-irradiation dose. Despite complete decomposition of MCPA in the industrial waste, in order to reduce the toxicity of irradiated waste, measured by the Microtox bioluminescence test, higher than a 10 kGy irradiation dose was needed.
反相高效液相色谱法测定除草剂MCPA及其辐射降解产物的方法已得到优化。辐射降解采用伽马辐射进行，并在辐射剂量和MCPA辐照溶液的pH值方面进行了优化。在纯溶液中分解100 ppm的MCPA需要3 kGy剂量的辐照。在高达10 kGy的剂量范围内，辐照的主要产物是各种酚类化合物和羧酸。所开发的方法应用于MCPA生产工业废料的处理。在工业废料样品中分解500 ppm的MCPA需要10 kGy的剂量；然而，在辐照废料中存在化学计量的过氧化氢可使伽马辐射剂量降低50%。尽管工业废料中的MCPA完全分解，但为了降低经Microtox生物发光试验测定的辐照废料的毒性，需要高于10 kGy的辐照剂量。
