基于Origin 7.0软件非线性拟合白浆土胡敏酸吸附Zn^(2+)的热力学过程  

Thermodynamic Process of Zn^(2+) Adsorbed on Humic Acid Extracted from Albic Soil Fitted by the Non-linear Curve from the Origin 7.0 Software

作　　者：马壮[1] 邸文静 王帅[3] 尹丽华 郭戎方 

机构地区：[1]吉林省水利水电勘测设计研究院,长春130021 [2]吉林市丰满区农业蔬菜技术推广中心,吉林吉林132013 [3]吉林农业科技学院植物科学学院,吉林吉林132101

出　　处：《中国农学通报》2014年第32期159-164,共6页Chinese Agricultural Science Bulletin

基　　金：国家科技支撑计划项目"东北平原中部(吉林)玉米水稻丰产节水节肥技术集成研究与示范"(2013BAD07B02)

摘　　要：基于Origin 7.0软件,非线性拟合热力学吸附过程不仅能够简单、准确得出热力学参数,且能将拟合效果直观表达出来。采用白浆土胡敏酸作为吸附剂,对Zn2+进行了热力学吸附过程的研究,并结合Origin 7.0软件对吸附规律进行了2种方式的拟合描述。结果表明:3个温度(293、303、313 K)条件下,热力学等温线存在共性,较低Zn2+平衡浓度范围内,吸附曲线近似直线上升,而随浓度继续升高,吸附曲线上升程度减缓,随后渐趋平衡。相比较而言,随温度升高,胡敏酸对Zn2+的吸附量逐渐增加,提升效果尤以高初始浓度条件下为最佳。运用Origin软件对热力学曲线进行拟合,可见Langmuir在描述两者间吸附规律的效果为最佳。同条件下,Origin自定义参数拟合的效果要优于软件自带方程。The non-linear fitting of thermodynamic adsorption process based on the Origin 7.0 software was not only simple and accurate, but also visually expressive. The humic acid（HA） extracted from albic soil as a sorbent was adopted to carry out the thermodynamic study of adsorbing Zn^2 ＋. Combined with Origin 7.0 software, the adsorption process was described in 2 ways. The results showed that： there were several similarities existed in 3 thermodynamic curves under the conditions of three temperatures（293, 303 and 313 K）. At the low range of Zn^2 ＋initial concentration, the adsorption curve increased approximately like a straight line, and with Zn2 ＋concentration increasing, the rising level of adsorption curve became slowly, and then gradually the adsorbed capacity reached at equilibrium. In comparison, the adsorption of Zn2 ＋into HA increased gradually with increasing temperature, especially at the high initial concentration of Zn2＋. The best description about adsorption process between HA and Zn^2 ＋was found in the Langmuir equation. Under the same condition, the fitting effect of self-defined parameters in the Origin software was better than the inherent equation existed in Origin itself.

关 键 词：ORIGIN软件 拟合 热力学 吸附 

分 类 号：S132[农业科学—农业基础科学]