Perfluoroalkane acids in human milk under the global monitoring plan of the Stockholm Convention on Persistent Organic Pollutants (2008–2019)

● Perfluorooctanesulfonic acid and perfluorooctanoic acid highest in human milk. ● All other perfluoroalkane substances had median values of zero (101 samples). ● Branched PFOS recommended to be analyzed separately from linear isomer. ● PFOS and PFOA showed differentiated regional and income distribution. ● Human health risk assessment values not yet available at global level. Within the global monitoring plan (GMP) established by article 16 of the Stockholm Convention on Persistent Organic Pollutants, perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA), and perfluorohexane sulfonic acid (PFHxS) are recommended for analysis in core matrices to assess occurrence and changes geographically and with time. In 101 samples consisting of 86 national pools and 15 pools from States in Brazil obtained between 2008 and 2019, PFHxS was detected in 17% of the national pools and none in Brazil. PFOA and PFOS had a detection frequency of 100% and 92%, respectively. Other perfluoroalkane substances (PFAS) had either low detection frequencies and median values of zero (carboxylic acids C₄–C₁₁; except PFOA) or could not be quantified in any sample (sulfonic acids, C₄–C₁₀, and long-chain carboxylic acids, C₁₂–C₁₄). Correlation between PFOA and PFOS was moderately (r = 0.58). Whereas median values were almost identical (18.9 pg/g f.w. for PFOS; 18.6 pg/g f.w. for PFOA), PFOS showed larger ranges (< 6.2 pg/g f.w.–212 pg/g f.w.) than PFOA (< 6.2 pg/g f.w.–63.4 pg/g f.w.). It was shown that wealthier countries had higher PFOA concentrations than poorer countries. No difference in concentrations was found for samples collected in countries having or not having ratified the Stockholm Convention amendments to list PFOS or PFOA. The goal to achieve 50% decrease in concentrations within ten years was met by Antigua and Barbuda, Kenya, and Nigeria for PFOS and by Antigua and Barbuda for PFOA. In a few cases, increases were observed; one country for PFOS, four countries for PFOA.     

Analysis of TCDD and TCDF on the ppq-level in milk and food sources

Analysis of 2378-TCDD and 2378-TCDF on the ppq-level in foods with high fat content is described. The migration over twelve days of 2378-TCDD, 2378-TCDF and 1278-TCDF from bleached paperboard cartons into whole milk was found to be exponential with time. A survey of selected fatty foods shows the presence of 2378-TCDD and 2378-TCDF in foodstuff.     

ZnO超细粉的制备及其抗菌性能研究

采用直接沉淀法和均匀沉淀法制备ZnO超细粉,研究光照、粒径的改变对ZnO超细粉抗菌性能的影响。     

AJS-2粉体静电消除器在本体法聚丙烯装置上的应用

静电是本体法聚丙烯生产和包装过程中的安全隐患.文中介绍了新型AJS-2粉体静电消除器的组成、基本原理及特点,并将南阳石蜡精细化工厂聚丙烯装置加装粉体静电消除器后在开机前后所测静电电位做对比,并与国标对照,说明加装粉体静电消除器后,大大提高了聚丙烯装置的安全性,消除了安全隐患.     

废混凝土粉在建筑砂浆中的应用研究

研究了废混凝土粉以不同取代率取代建筑砂浆中的天然砂对砂浆的和易性及强度的影响 ,结果表明 ,废混凝土粉可以取代建筑砂浆中的部分天然砂配制再生骨料砂浆。     

粉煤灰和高铁酸钾联合处理造纸废水的研究

通过实验研究得到采用酸化后的粉煤灰与高铁酸钾联合处理造纸废水,可使废水达到排放标准。     

金属静电粉末喷涂清洁生产途径探讨

清洁生产作为防治污染的最佳模式,是实现可持续发展和循环经济的必由之路.根据目前金属静电粉末喷涂典型生产工艺流程,分析其产污环节及污染物排放情况,并从原料、工艺和设备出发,探讨金属静电喷涂的清洁生产途径,以减少静电喷涂过程污染物排放对环境和生态的影响.     

钢板酸洗液回收Fe2O3粉制取高档永磁铁氧体预烧料的研究

以钢板酸洗废酸液回收的Fe2O3粉为主要原料，制备了永磁铁氧体预烧料及器件。研究了工艺制度如预烧温度、保温时间、摩尔比对预烧料磁学性能的影响等。制取的永磁铁氧体材料的磁性能达到Br=420mT，Hcb=215KA／m，（BH）max=32．4KJ／m^3。     

磁性活性污泥在废水处理中作用机理的探讨

文章主要讨论了磁性活性污泥在废水处理中的作用机理,指出了在活性污泥中加入磁性粉末后,使活性污泥的结构得到了改善,污泥的沉降性能、污泥中微生物活性及抗污染物冲击负荷能力都优于普通活性污泥,并且使污泥对废水中的有机物、N、P等营养物质及重金属的去除效率有较大的提高.这主要与磁性粉末有较大比表面积及表面的键态、电子态有关.     

关于如何拓宽胶粉应用的思考

为了拓宽胶粉的应用，主要从精细和超细胶粉的生产、胶粉的表面改性、再生胶粉的生产三个方面阐述了拓宽胶粉应用的途径和可行性。