主题：【求助】（还剩1和4）再求助几篇老文献

1
Leenheer J. A., Huffman E. W. D., Classification of organic solutes in water by using macro reticular resins [J]. Journal Research U.S. Geology Survey, 1976,4(6):737~751

2
Hatcher P. G., Rowman R., Mattingly M. A., 1H and 13C NMR of marine humic acids [J]. Organic Geochemistry, 1980,2(2):77~85

3.
Wilson M. A., Collin P. J., Tate K. R., 1H-Nuclear magnetic resonancestudy of a soil humic acid [J]. European Journal of Soil Science, 1983,34(2):297~304

4
Lin W. O., Alt H. G., 1H and 13C-NMR spectroscopic evidence for the complexation of potassium cations by cyclohexanedioxydiacetamides [J]. Z. Naturforsch, 1985,406:441~442

5
Plechanov N., Studies of molecular weight distributions of fulvic and humic acids by gel permeation chromatography. Examination of the solute molecular composition using RI, UV, fluorescence and weight measurement as detection techniques [J]. Organic Geochemistry, 1983,5(3): 143~149

6
Kuwatsuka S., Tsutsuki K., Kumada K., Chemical studies on soil humic acids. I. Elementary com-position of humic acids [J]. Soil Science and Plant Nutrition, 1978,24:337~347

7
Bourbonniere K. A., Distribution patterns of disslved organic matter fractions in natural waters from eastern Canada [J]. Organic Geochemistry, 1989,14(1):97~107

8
Spiteller M., Isolation and characterisation of dissolved organic carbon from natural and Iysimeter waters by ultrafiltration [J]. The Science of the Total Environment, 1987,62:47~54

9
Homann P.S., Grigal D.F. Molecular weight distribution of soluble organics from laborato-ry-manipulated surface soils [J]. Soil Science Society of America Journal, 1992,56:1305~1310


10
Dawson H. J., Hrutfiord B. F., Zachara J., The molecular weight and origin of yellow organic acids [J]. Soil Science, 1981,132:191~199