摘要
通过对环境标准样进行31P-NMR测试,研究了磷的化学结构与化学位移的关系.结果表明:无机正磷酸盐(PO43-)化学位移在6.412×10-6,焦磷酸盐的化学位移在-4.353×10-6;多聚磷的化学位移分布特点是:主链末端磷化学位移在-3.53×10-6至-4.40×10-6之间,中间磷在-18.159×10-6至-20.246×10-6之间,有机磷中单酯和二醑的化学位移分别在4.3540×10-6至6.3652×10-6和-0.107×10-6至2.195×10-6之间,部分二脂不稳定,会降解为单脂;膦酸盐的化学位移在18.670×10-6至21.460×10-6之间,磷酸肌酸位于-0.380×10-6,有机多聚磷中α-P的化学位移在-8.833×10-6至-9.449×10-6之间,由于偶合作用产生P峰的裂分,P峰的偶合符合核磁中n+1的规则.结构环境影响31P的化学位移值的偏移.
By testing a series of solution ^31P-NMR spectroscopy of model phosphorus compounds including inorganic phosphate, orthophosphate monoesters and diesters, and organic polyphosphate（determined in lmol/L NaOH and 16.7% D2O）, standard phosphorus spectra were obtained as references for solution ^31p-NMR studies of sediment phosphorus. The results showed that the ^31p-NMR signals of phosphorus compounds interested in environmental studies generally fall between 6.5×10^-6 and -25 ×10^-6, including orthophosphate at 6.412 × 10^-6, pyrophosphate at -4.353 × 10^-6, polyphosphate at -18.159×10^-6 to -20.246×10^-6 （middle group P） and -3.53×10^-6 to -4.40×10^-6 （terminal P）, orthophosphate monoesters at 4.3540×10^-6 to 6.3652×10^-6, orthophosphate diesters at -0.107×10^-6 to 2.195×10^-6, and organic polyphosphate at -8.833×10^-6 to 9.499×10^-6 for the α-P. Structure surroundings effect the chemical shifts of phosphorus compounds.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2008年第1期45-50,共6页
Journal of Lake Sciences
基金
国家自然科学基金项目(40611087)
院长奖获得者科研启动专项资金
中国科学院南京地理与湖泊研究所所长科研专项基金联合资助．
