【摘要】 0 1mol/LHCl-4 0mg/mLTritonX 100-0 05mol/LBaCl2溶液体系的同步散射很弱,加入SO2-4浓度在4后,形成的(BaSO4)n微粒在470nm处产生一较强同步散射峰,SO2-2 0～80μg/mL浓度范围内与I470呈线性关系,据此建立了一个简便灵敏的测定水泥样品中硫酸根的同步散射光谱分析新方法。其相对标准偏差(RSD)在1 3%～2 7%之间,回收率在98 4%～101%之间。研究结果表明,由于静电引力SO2-4与Ba2+之间可形成BaSO4分子,而BaSO4分子间存在较强疏水作用力和分子间作用力可聚集形成(BaSO4)n微粒和固液界面,(BaSO4)n微粒和固液界面的形成是导致体系同步散射增强的根本原因。更多还原

【Abstract】 There is very weak synchronous scattering for the system of 0.1 mol/L HCl-4.0 mol/L Triton X-100-0.05 mol/L BaCl₂. When SO₄^2- is added,Ba²⁺ reacts with SO₄^2- to form （BaSO₄）_n particles.The particle has a strong synchronous scattering peak at 470 nm.The synchronous scattering intensity at 470 nm is linear to SO₄^2- concentration in the range of 2.0-80 μg/mL.And a novel synchronous scattering spectral method has been described for the determination of SO₄^2- in cement samples.The method is simple and sensitive.Its RSD is in the range of 1.3%-2.7%,and the recovery is in the range of 98.4%-101%.The results show that SO₄^2- and Ba²⁺ combine to BaSO₄ molecule by means of electrostatic force.The BaSO₄ molecules form （BaSO₄）_n particles and solid-liquid interface owing to existence of strong hydrophobic interaction and intermolecular forces.Both of the particle and interface bring about the enhancement of synchronous scattering intensity.更多还原