水环境重金属分布综合化学模拟——江西永平地区水体铜、锌、镉形态分布研究

本文用综合化学模拟的方法,以江西永平地区水体为背景,对铜、锌、镉在不同形态中的分布规律进行初步研究。 模拟水系统包括5种重金属Cu、Zn、Cd、Co、Ni,5种无机配位体SO_4~-、Cl~-、NH_3、HCO_3~-、CO_3~-,一种有机配位体HA和一种吸附剂高岭石。系统中用到的重金属HA络合平衡与高岭石吸附平衡常数通过模拟实验测定;无机络合常数由数表查取。系统的平衡特征用一个含有81个方程的非线性方程组描述。该方程组用最速下降法求解,计算过种用AIGOL-60语言编成程序,在TQ-16计算机上执行。

A COMPREHENSIVE CHEMICAL MODEL FORHEAVY METAL DISTRIBUTION IN AQUEOUSENVIRONMENT---Cu, Zn, Cd Distribution in a Water Body nearYong Ping Copper Mine

An attempt has been tried on preliminary investigation of Cu, Zn, Cd distribution in a water body near Yong Ping copper mine.The model covers systems of heavy metals such as Cu, Zn, Cd, Co, Ni, inorganic ligands (SO^-₄, Cl^-, NH₃, HCO₃, CO^3-), organic ligand (humic acid from natural sources)and a kind of adsorbent(kaolinite).The different chemical components were quantitatively correlated in accordance with the mass action law and principle of conservation after chemical equilibrium of the system had been established. The equilibrium constants of the organic complex system and adsorption of heavy metals, in this system, were measured by modeling experiments, while the inorganic complex constants were selected from literature. Equilibrium characteristics of the system are expressed in terms of a set of non-linear equations 81 in number. This set of equations was calculated by means of steepest descent, and the calculation program was done based on ALGOL-60 language and conducted on computer TQ-16 which is made in-China.Some preliminary conclusions have been readied from this work about the species distribution pattern in the aquatic environment of Yong Ping area.