This work addresses the surface properties and solubility parameters of sodium alginate (SA) using the inverse gas chromatography (IGC) technique. The dispersive component of the surface free energy,γ_S^D, of the studied adsorbent surface was calculated in the infinite dilution region. The specific enthalpy of adsorption,ΔH^S, the specific free energy of adsorption, ΔG^S, and the specific entropy of adsorption, ΔS^S, of solvents on SA were determined. The acidic K_A and the basic K_D parameters of the SA surface were calculated. The values obtained for K_A and K_D parameters indicated that the SA surface has a basic character. The interactions between 16 solvents and SA were investigated at a temperature range (373.2–398.2 K). The weight fraction activity coefficient,Ω₁^∞, Flory–Huggins interaction parameter, χ₁₂^∞, equation-of-state interaction parameter, χ₁₂^*, and effective exchange energy parameter, X_eff, of the SA–solvent system were estimated. The results indicated that all the studied solvents are poor solvents for SA. This means that it can be used in the packaging food and biomedical field. The solubility parameter of SA, δ₂, was determined as 17.5 (cal/cm³)^1/2.

中文翻译：

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反相气相色谱法对海藻酸钠的热力学表征

这项工作使用反相气相色谱（IGC）技术解决了海藻酸钠（SA）的表面性质和溶解度参数的问题。表面自由能的分散成分，γ_小号^d，所研究的吸附剂表面的是在无限稀释区域中计算。测定了在SA上的溶剂的比吸收焓ΔH ^S，比吸附自由能ΔG ^S和溶剂的比熵ΔS ^S。酸性ķ_甲和基本ķ _d的SA表面的参数进行了计算。获得的K _A和K值_D参数表示SA表面具有基本特征。在温度范围（373.2–398.2 K）下研究了16种溶剂与SA之间的相互作用。的重量分数活度系数，Ω ₁ ^∞，弗洛里-赫金斯相互作用参数，χ ₁₂ ^∞，方程-的状态相互作用参数，χ ₁₂ ^*，和有效地交换能量参数，X _EFF，的SA-溶剂系统进行了估计。结果表明，所研究的所有溶剂都是SA的不良溶剂。这意味着它可以用于包装食品和生物医学领域。SA的溶解度参数，δ ₂，被确定为17.5（卡/厘米³）^1/2。