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《上海化工》2021,(5)
依据GB/T 38420—2019《玩具聚碳酸酯和聚砜材料中双酚A迁移量的测定高效液相色谱-串联质谱法》中对双酚A迁移量的检测要求,用水提取聚碳酸酯和聚砜材料试样中的双酚A,提取液用高效液相色谱-串联质谱仪(HPLC-MS/MS)进行定性及定量分析,并对该方法进行不确定度评估,依据《测量不确定度评定与表示指南》建立数学模型,进行不确定度的计算并合成不确定度。结果表明:玩具聚碳酸酯和聚砜材料中双酚A迁移量的测量不确定度主要来源为标准工作曲线、样品重复性和标准物质纯度,双酚A的不确定度为(0.021±0.002)mg/L,k=2;不确定度评定方法和程序符合规范要求,适用于同类型实验的不确定度评定。 相似文献
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开发并验证了一种定量分析厄贝沙坦中2种基因毒性杂质的超高效液相色谱-串联质谱(UPLC-MS/MS)方法。釆用Agilent ZORBAX Eclipse plus C18色谱柱(3.0 mm×100 mm, 1.8μm),0.1%甲酸水溶液-甲醇为流动相梯度洗脱,大气压化学电离、正离子平行反应监测模式(APCI+PRM)进行检测,结果显示N-亚硝基二甲胺(NDMA)和N-亚硝基二乙胺(NDEA)在0.225~1.5 ng/mL浓度范围内线性关系良好,检测限(LOD)为0.022 ng/mL、0.044 ng/mL,供试品加标溶液回收率为78%~103%。所建立的方法灵敏、准确,可满足对厄贝沙坦中2种N-亚硝胺类基因毒性杂质的检测。 相似文献
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评定电感耦合等离子体质谱法(ICP-MS)同时测定化妆品中铅、镉、砷的不确定度。采用微波消解-电感耦合等离子体质谱法,以72Ge、115In、209Bi作为内标,同时测定化妆品中铅、镉、砷。根据《化妆品安全技术规范》(2015年版)方法,建立数学模型,对化妆品中铅、镉、砷的精密度、回收率进行验证,同时分析测定过程中的不确定度来源,并评定各标准不确定度的分量。由实验结果可知,化妆品中砷含量测定结果不确定度为(2.04±0.18) mg/kg,k=2;镉含量测定结果不确定度为(4.84±0.28)mg/kg, k=2;铅含量测定结果不确定度为(10.1±0.6)mg/kg,k=2。该方法影响检测结果不确定度的主要因素为标准物质、校准曲线、加标回收率及测量重复性。 相似文献
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Tengfei Fan Jianguo Feng Chao Ma Chi Yu Jing Li Xuemin Wu 《Journal of Porous Materials》2014,21(1):113-119
Porous microspheres with different sizes were prepared through solvent evaporation method with ethylcellulose as a matrix material and abamectin as a core material. The abamectin-loaded microspheres were characterized through scanning electron microscopy (SEM), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The chemical structure of the microspheres was determined through FTIR. DLS analysis showed that the diameter of the microspheres range from 10 to 100 μm. SEM analysis revealed that the inner structure of the microspheres is characterized by a porous network. TGA revealed that the microspheres are thermally stable below 125 °C. The controlled release of abamectin from the microspheres into water and soil was also investigated. Abamectin was released from microspheres into water through diffusion. The release of abamectin into soil was mainly caused by erosion, a result that was verified through SEM. 相似文献
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新型干法水泥是目前水泥行业的发展趋势,中央控制室是新型干法水泥生产线的控制指挥中心。预分解窑系统需要控制的参数较多,综合考虑各参数的变化将有利于窑系统的稳定运行。窑头和窑尾参数是准确判断窑系统运行状况的重要参数,包括窑尾的温度、压力,窑头的温度、压力,窑尾的气体分析等,在操作中应引起操作员的重视。 相似文献
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Development of microstructure in four hydrothermal reactions has been undertaken using scanning electron microscopy. These are clinker, clinker-sand, slag-lime and slag-lime-sand hydrothermal reactions. The microstructure of clinker hydration products displayed crumpled foils and tabular masses of calcium silicate hydrates; few cubic crystals of hydrogarnet appeared only during the initial stage of the reaction. In clinker-sand mixture the C-S-H phase was the only product identified. In slag-lime hydration the microstructure displayed both of the hydrogarnet crystals and the C-S-H phase. The hydration of slag-lime-sand mixture (an optimum composition) was associated with the formation of ill-crystallized tobermorite and crystalline 11A tobermorite as the main products. 相似文献
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西玛津在甘蔗及土壤中的残留消解动态 总被引:1,自引:0,他引:1
为了探明西玛津使用后在甘蔗及其土壤中的残留降解规律,采用气相色谱法研究了西玛津90%水分散粒剂在甘蔗及其土壤中的残留消解降解动态和最终残留实验。结果表明:西玛津在甘蔗和土壤中的降解动态方程分别为Ct=19.157e-0.0587t和Ct=1.689 8e-0.036t,半衰期分别为11.8 d和19.3 d;以1 647 g a.i./hm2和2 470.5 g a.i./hm2的剂量在甘蔗田进行喷雾处理,收获期甘蔗和土壤中的最终残留量分别小于0.01 mg/kg和0.02 mg/kg。 相似文献
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介绍了近年来受阻胺类光稳定剂(HALS)新产品的研究开发情况,高分子量化受阻胺、多功能化受阻胺、低碱性化受阻胺和反应型受阻胺等不断出现;应用研究取得新进展,对PVC体系中有较好稳定的作用。 相似文献
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The metabolism of malonaldehyde (MA) was investigated in vivo using male Wistar rats and in vitro using rat liver mitochondria.
Twelve hr after intubation with [1,3-14C] MA, 60–70%, 5–15% and 9–17% of administered radioactivity was recovered in expired CO2, feces and urine, respectively. In rats intubated with [1,2-14C] acetate, the corresponding values were 68–82%, 1–2% and 2–3%.14CO2 evolution was initially slower after14C-MA administration than after14C-acetate administration and more radioactivity was excreted in the feces and urine. In vitro experiments using [1,3-14C] MA showed that MA is metabolized primarily in the mitochondria via reactions involving O2 utilization and14CO2 production. The apparent Km and Vmax were 0.5 mM and 9.3 nmol/min/mg protein for O2 uptake, respectively, and 2.0 mM and 2.4 nmol/min/mg protein for14CO2 production. Addition of malonic acid to mitochondrial incubates at concentrations inhibitory to succinate dehydrogenase did
not affect MA-induced O2 uptake but enhanced14CO2 production from14C-MA.14C-Acetate appeared to be the major accumulating metabolite in rat liver mitochondrial preparations following a 120-min incubation
with14C-MA. A probable biochemical route for MA metabolism involves oxidation of MA by mitochondrial aldehyde dehydrogenase followed
by decarboxylation to produce CO2 and acetate. 相似文献
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2002年统计了38家主要表面活性剂及其原料的生产企业的产销数据,与上年相比新增企业(5家)有:无锡罗地亚、无锡合成化工、天津先光、上海石化科技、天津浩元。因未报产销量未进统计数据的企业有泸天化、宿州生物化工(原宿州洗化)。大连华能因2002年被吉联(吉林)租赁生产脂肪醇和AES.因此,其产销量并入吉联(吉林),2002年.统计入围厂家数比上年增加了3家. 相似文献