纸尿裤产品的质量风险监测分析

对四川省人口较多具有代表性的几个地区流通市场的纸尿裤(片、垫)进行随机抽样检测,并进行质量风险监测分析,对产品的渗漏性能、卫生指标和荧光性物质3项指标进行了检测。监测结果:纸尿裤风险检出率为64.0%,其中渗漏性能指标风险检出率所占比例为24.4%,风险等级为中等风险;卫生指标风险检出率所占比例为0,风险等级为低风险;荧光性物质指标风险检出率所占比例为75.6%,风险等级为严重风险。按照规定,最终确认此次纸尿裤风险监测的风险等级属于严重风险,风险主要来源于纸尿裤产品中存在的荧光性物质。     

聚四氟乙烯纤维的制备技术及应用进展

介绍了聚四氟乙烯(PTFE)的结构和性能,重点阐述了膜裂纺丝法、糊料挤出纺丝法和载体纺丝法等制备PTFE纤维的纺丝工艺,并展望了我国PTFE纤维的应用前景。     

Spectral induced polarization signatures of hydroxide adsorption and mineral precipitation in porous media

The spectral induced polarization (SIP) technique is a promising approach for delineating subsurface physical and chemical property changes in a minimally invasive manner. To facilitate the understanding of position and chemical properties of reaction fronts that involve mineral precipitation in porous media, we investigated spatiotemporal variations in complex conductivity during evolution of urea hydrolysis and calcite precipitation reaction fronts within a silica gel column. The real and imaginary parts of complex conductivity were shown to be sensitive to changes in both solution chemistry and calcium carbonate precipitation. Distinct changes in imaginary conductivity coincided with increased hydroxide ion concentration during urea hydrolysis. In a separate experiment focused on the effect of hydroxide concentration on interfacial polarization of silica gel and well-sorted sand, we found a significant dependence of the polarization response on pH changes of the solution. We propose a conceptual model describing hydroxide ion adsorption behavior in silica gel and its control on interfacial polarizability. Our results demonstrate the utility of SIP for noninvasive monitoring of reaction fronts, and indicate its potential for quantifying geochemical processes that control the polarization responses of porous media at larger spatial scales in the natural environment.     

紫甘薯色素上染羊毛织物的抗菌性研究

采用紫甘薯色素水溶液对羊毛织物进行直接染色,通过正交试验和单因素分析,考察了pH值、染料质量浓度、温度、时间等因素对上染百分率、色差及抑菌率的影响.确定了羊毛织物最佳的抗菌染色一浴工艺为:染料质量浓度7 g/L,pH值4,温度80℃,时间45 min,浴比1∶30.结果表明,采用紫甘薯色素染色的羊毛织物不仅具有较好的耐洗和耐摩擦色牢度,并有较高的抑菌率,对金黄色葡萄球菌的抑菌率可达98％.