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美国食品和药物管理局(FDA)根据法定分析化学协会/美国材料试验协会(AOAC/ASTM)所制定的测试方法,用原子吸收火焰光度计,对与食物接触的陶瓷器皿的铅溶出量进行测定。还有一些分析技术,如原子吸收石墨炉法,感应耦合等离子发射光谱和放射性同位素源X—射线发射光谱等,也用于测定陶瓷器皿的铅溶出量和釉料中的含铅量。近年来,在进行大量样品现场筛选时,还采用显色试剂快速检验法。本文对上述方法的优缺点及有关测试结果进行了分析和讨论。 相似文献
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《佛山陶瓷》2021,31(8)
考察摩擦行为对日用陶瓷中铅镉溶出量的影响,分别采用GB31604.34-2016 《食品安全国家标准食品接触材料及制品铅的测定和迁移量的测定》和GB 31604.24-2016《食品安全国家标准食品接触材料及制品镉迁移量的测定》规定的方法,检测市售新的日用陶瓷器皿和长期使用过的日用陶瓷器皿中铅镉溶出量的情况。溶出量试验条件分别为4%(体积分数)乙酸溶液于22±2℃温度下,浸泡24h±20min,研究动态摩擦行为对市售日用陶瓷器皿中铅镉溶出量的影响。结果表明,长期使用摩擦后日用陶瓷第一次浸泡,铅镉溶出量明显高于新购买的日用陶瓷第一次浸泡。并实验不同摩擦次数对铅镉溶出量的影响,结果表明,摩擦行为促进日用陶瓷中铅镉溶出量,当动态摩擦到达7次后,铅镉溶出量基本到达平衡。 相似文献
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前言随着国际贸易的日益发展以及中国加入世界贸易组织,日用陶瓷的生产量和出口量将越来越大,日用陶瓷铅、镉溶出量问题是日用陶瓷出口关注的重点,各国对铅、镉溶出量的规定越来越严,铅、镉溶出量是否合格是决定日用陶瓷能否走向市场的关键因素之一。因此,检测实验室应十分重视 相似文献
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主要介绍了在日用陶瓷铅镉溶出量的整个检测过程中应注意的问题,及这些问题对铅镉溶出量的检测结果有何影响。 相似文献
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日用陶瓷铅镉溶出量超标的原因及其控制 总被引:2,自引:0,他引:2
本文针对醴陵地区多次出现出口陶瓷产品铅镉溶量不合格的现象,列举了有关标准对陶瓷产品铅镉溶出量的限量要求,并提出了改进措施。 相似文献
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为解决日用瓷铅镉溶出问题和提高装饰档次,研制成功18种高温快烧颜料色基及专用熔剂。经测试,18种颜料的各项指标全部达到国家标准要求,铅镉溶出量全部为0.0mg/dm2. 相似文献
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以R2O—B2O3-SiO2系为主进行了釉上丝网印色料无铅助熔剂的实验。通过添加适量的ZnO.Al2O3.ZrO2,LiF等使熔剂达到应用要求,并研制成功4种无铅釉上丝网印色料。经测试.该色料的各项指标均符合QB583—81标准要求,铅镉溶出量全部为0.0mg/dm2。 相似文献
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Jerzy Narbutt 《溶剂提取与离子交换》2013,31(5):1271-1280
ABSTRACT Hydration of lead(II) acetylacetonate and its solvation by trioctylphosphine oxide and chloroform, were studied by solvent extraction and compared with those of zinc(II) acetylacetonate. The results suggest that the 6s2 lone electron pair of the PbII ion in the chelate is stereochemically active. 相似文献
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以硫化钠为除杂剂,采取浸取和除杂同时进行的工艺,使原料中的铅、镉、铜等杂质转化为不溶于氨水的硫化物,并在过滤时与锌分离,使浸取液得以净化。该工艺简化了传统配合法的工艺流程,改善了生产环境 相似文献
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氨浸法从含砷粗氧化锌制活性氧化锌研究 总被引:4,自引:2,他引:2
在碱性氨浸法处理含有砷、铅的低级氧化锌制取活性氧化锌的工艺中,引入铁盐除砷方法,解决了氨浸法生产活性氧化锌中除砷的问题,对于含砷1%~2%的原料,产品中的砷含量可降低至0.0005以下,本方法还为含砷的铜、镍、钴废料的利用提供了参考途径。 相似文献
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硫属铋镉化物着色玻璃显色过程的研究 总被引:3,自引:0,他引:3
本文对以硫属铋镉化物着色玻璃的显色过程进行了系统的研究与讨论。X射线衍射、透射电镜、电子衍射及EDAX能谱分析表明;玻璃在显色过程中析出了由CdS(Se)和Bi_2Se_3等半导体化合物组成的固溶体微晶,其组成随显色温度的提高而改变,从而造成玻璃光吸收的变化。ZnO参与了玻璃的显色过程。从热力学与动力学的观点分析了玻璃的显色过程,对实验结果作了较为圆满的解释。 相似文献
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Sher Bahadar Khan Mohammed M Rahman Hadi M Marwani Abdullah M Asiri Khalid A Alamry 《Nanoscale research letters》2013,8(1):377
Zinc oxide nanosheet is assessed as a selective adsorbent for the detection and adsorption of cadmium using simple eco-friendly extraction method. Pure zinc oxide nanosheet powders were characterized using field emission scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The zinc oxide nanosheets were applied to different metal ions, including Cd(II), Cu(II), Hg(II), La(III), Mn(II), Pb(II), Pd(II), and Y(III). Zinc oxide nanosheets were found to be selective for cadmium among these metal ions when determined by inductively coupled plasma-optical emission spectrometry. Moreover, adsorption isotherm data provided that the adsorption process was mainly monolayer on zinc oxide nanosheets. 相似文献
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《溶剂提取与离子交换》2013,31(6):751-764
ABSTRACT The extraction of zinc(II) and cadmium(II) from chloride solution by mixtures of primary amine N1923 and Cyanex272 (HA) was studied. The synergistic effect was observed for the extraction of zinc(II) while no synergistic effect for cadmium(II), which makes it possible to separate zinc(II) and cadmium(II) with the mixtures. The results showed that zinc(II) was extracted as (RNH3Cl)3·ZnClA instead of ZnA2·2HA which was extracted by Cyanex272 alone. The extraction mechanism was discussed and the formation constants and thermodynamic functions were determined. The separation factors between zinc(II) and cadmium(II) were calculated. 相似文献
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A representative series of colors, blue, brown, green, red, and yellow, was selected for this investigation. Variations of the constituents for these five stains were made and the resulting colors produced in the enamels were measured by means of spectrophotometric curves. The influence of additions of barium oxide, lead oxide, and zinc oxide to the frit was also studied. The addition of lead oxide to the frit tended to give greater solution of the blue stains. The barium oxide additions dissolved the lead antimonate yellow the most, while the lead oxide had the least effect on the yellow stains. Variations in calcination temperatures of the red stains produced decided changes in color. The additions of lead oxide darkened the color produced with the red stains. 相似文献
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