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本文提出用有机物在沉积物上的色谱比保留体积(V_g)值估算沉积物有机碳吸附系数(K_∝)。为此,以河流沉积物作气相色谱固定相,用测定气相色谱固定液相对极性和有机物比保留体积的方法,测定了沉积物相对极性(P)和有机物在其上比保留体积,研究了V_g与K_∝的相关性。结果表明,萘和硝基苯在供试沉积物上K_∝随V_g的增加而增加,两者的对数值有较好的线性关系。萘的线性关系式为logK_∝=0.18logV_g+3.11(r=0.9831,n=5)。硝基苯的关系式为logK_∝=0.24logV_g+2.59(r=0.9544,n=5)。用上述关系式估算K_∝,估算值与实测值吻合较好(萘±0.03对数单位,硝基苯±0.07对数单位)。同时,用沉积物相对极性的测定结果,较好地解释了V_g与K_∝的关系。
In this paper, the organic carbon adsorption coefficient (K_α) of sediment was estimated using the chromatographic retention volume (V_g) value of organic matter on the sediments. Therefore, river sediment was used as the stationary phase of the gas chromatography. The relative polarities (P) of the sediments and the retained volume of the organic matter on the stationary phase were determined by comparing the relative polarities of the GC stationary phase with the retention volume of organic matter. The correlation between V_g and K_α. The results showed that the K_α of naphthalene and nitrobenzene increased with the increase of V_g, and the logarithm value of naphthalene and nitrobenzene had a good linear relationship. The linear relationship of naphthalene is logK_α = 0.18 logV_g + 3.11 (r = 0.9831, n = 5). Nitrobenzene has the logK_α = 0.24 logV_g + 2.59 (r = 0.9544, n = 5). K_α was estimated using the above equation, and the estimated value agrees well with the measured value (naphthalene ± 0.03 log units, nitrobenzene ± 0.07 log units). Meanwhile, the relationship between V_g and K_α is well explained by the determination of the relative polarity of sediments.