玉米平衡水分测定及等温线方程确定  

Fitted Parameters of EMC/ERH Model for Chinese Shelled Corn

作　　者：王双林[1] 郭道林[1] 李兴军[2] 陈兰[1] 栾霞[2] 

机构地区：[1]国家粮食储备局成都粮食储藏研究所,成都610031 [2]国家粮食局科学研究院,北京100037

出　　处：《中国粮油学报》2010年第11期33-36,47,共5页Journal of the Chinese Cereals and Oils Association

基　　金：国家粮食局科学研究院科研业务费专项(ZX0708-1)

摘　　要：采用静态称重法对6个玉米品种的吸附/解吸等温线进行测定,并用6个非线性回归方程描述吸附/解吸等温线,修正Chung-Pfost方程(MCPE)、修正Henderson方程(MHE)、修正Oswin方程(MOE)及Strohman-Yoerger方程(STYE)均在ERH 11.3%～96%范围内适合描述玉米等温线,其中最佳数学模型是MCPE,以M=f(ERH,t)形式表达的M=-1/C3×ln[-1/C1×(t+C2)ln(ERH)],C1、C2及C3参数对吸附数据分别是863.159、108.443及0.216,对解吸数据分别是581.393、35.840、0.235,平均数据是655.792、59.035、0.225。分析MCPE方程预测的6个玉米品种解吸或吸附等温线之间的差异,6个品种解吸等温线之间有差异,但是6个品种吸附等温线之间没有差异。解吸与吸附等温线之间存在滞后现象。Equilibrium moisture content（EMC） data for the shelled corn of six cultivars were obtained by the gravimetric method at 11% to 96% relative humidity（ERH） and 10,15,20,25,30,and 35℃ above nine saturated salt solutions.Six non-linearity regression equations were used to describe desorption / adsorption isotherms.Results： Four commonly used mathematic models,modified-Chung-Pfost（MCPE）,modified-Henerson（MHE）,modified-Oswin（MOE）,and Strohman-Yoerger（STYE）,are fitted to the data with evaluating the coefficient of determination,residue sum-of-squares,standard error of estimate,mean relative percent error,and residual plots.The best-fitted equations to the EMC/ERH data are STYE and MCPE;as MCPE is three-parameter and readily transformed equation,so is adopted in this study.The three parameters,C1,C2,and C3 of MCPE in a form of M = f（ERH,t） are 863.159,108.443,and 0.216 for adsorption isotherm of shelled corn,and 581.393,35.840,and 0.235 for desorption isotherm of shelled corn,respectively.The three parameters,C1,C2,and C3 for average values of desorption and adsorption data are 655.792,59.035,and 0.225,respectively.At a constant relative humidity,equilibrium moisture content decreases with increasing temperature.There is hysteresis between desorption isotherms and adsorption isotherms.

关 键 词：平衡水分 玉米 吸附 解吸 等温线 

分 类 号：S114[农业科学—农业基础科学]