傅里叶变换红外光谱法测定甲基硅油

研究了几种溶剂对傅里叶变换红外光谱法 (FTIR)测定甲基硅油的影响 ,发现用正已烷作溶剂时测定的效果最佳。选择甲基硅油在 80 0cm- 1 左右的吸收峰 ,用峰高法测定吸光度。吸光度与浓度呈现良好的线性关系 ,相关系数r =0 .9982 ,经t检验法检验和加标回收实验证明该法准确可靠。     

傅里叶变换红外光谱法检验塑料吸管的研究

利用傅里叶变换红外光谱仪,对塑料吸管样本分析检验。依据红外光谱图中吸收峰,可以将塑料吸管样本加以区分。该检验方法不破坏检材,重现性好,可用于鉴定塑料吸管物证。     

傅里叶变换红外光谱法测定白酒中乙醇含量

建立快速测定酒精饮品中乙醇含量的衰减全反射-傅里叶变换红外光谱（ATR-FTIR）法,以ZnSe槽行板为ATR晶体,以水为背景采集样品的FTIR图。以1 044 cm-1的C-OH伸缩振动为特征峰,用峰面积表示整个吸光度以消除尖峰干扰,建立了其线性关系数0.998 6,乙醇水溶液的检测限为0.2%。该方法准确、方便、快速,适用于酒精饮品中乙醇含量的快速测定。     

用光声傅里叶变换红外光谱法检测聚合物材料

光声傅里叶变换红外光谱法(PAFT—IRS)是一种新的光谱法,可以对各种聚合物材料的表层进行非破坏性检测对表层的不同深度进行剖析研究。本文列举了用这种方法检测表面物质表层与基材之间的界面化学添加剂在纺织材料中的分布化学改性的聚对苯二甲酸乙酐纤维以及聚合材料的氧化和降解。这种方法能检测试样的测试深度内的化学性质变化。与里傅叶变换红外光谱法(FF—IRS)相比,它具有许多优点。     

傅里叶变换红外光谱法检验手帕纸包装袋的研究

利用傅里叶变换红外光谱法,对不同品牌、不同系列的手帕纸包装袋样本进行分析检验。依据红外光谱图中吸收峰,可以将手帕纸包装袋样本加以区分。该检验方法不破坏检材,重现性好,可用于鉴定手帕纸包装袋样本。     

傅里叶变换红外光谱法测定B–GAP羟值

为解决支化聚叠氮缩水甘油醚(B–GAP)羟值测试不稳定的问题,选用异氰酸苯酯对B–GAP进行衍生处理使羟基转化成酯基,采用傅里叶变换红外光谱法测定产物中酯基的吸光度以间接得到B–GAP羟值;研究了衍生时间、异氰酸苯酯用量等对测定结果的影响。结果表明,B–GAP羟值与衍生后分子链中酯基的红外特征峰吸收峰强度之间可进行定量关联,用该方法测定羟值,具有较好的重复性和较高的准确度。     

傅里叶变换红外光谱法测定SAN中丙烯腈组分含量

采用傅里叶红外光谱（FTIR）法定量分析丙烯腈-苯乙烯共聚物（SAN）中的丙烯腈,利用丙烯腈在2237 cm-1处的吸收峰及苯乙烯在700 cm-1处的吸收峰,建立了FTIR法快速测定SAN中丙烯腈组分含量的标准工作曲线,对其准确性和精密度进行了评价。结果表明,测定样品的最大相对误差为2.8 %,重复测定同一样片的相对标准偏差为2.48 %,方法的准确性和精密度良好。     

用裂解-傅里叶变换红外光谱法分析高分子材料

<正> 在高分子材料的分析中,傅里叶变换红外光谱(FT-IR)是一种很有效的方法。但对某些高分子制品,特别是交联和复合材料不能用一般方法制样,此时通常将样品放在试管中加热裂解,取冷凝在管壁的液相产物再进行红外光谱分析,这种方法的热解条件不易控制,且只能鉴定裂解后的液相组分。本文     

傅里叶变换近红外光谱法快速测定聚氯乙烯的K值

研究了傅里叶变换近红外光谱技术快速测定聚氯乙烯K值的分析方法。采用漫反射方式和偏最小二乘法 (PLS),建立了聚氯乙烯K值定量分析数学模型,其决定系数(R2)和均方差(RMSECV)分别为97．96％和0．362。实验结果表明:近红外分析法和实验室标准分析方法测定结果基本一致。本方法重复性好,具有快速、操作简单、无污染等诸多优点。     

Fourier transform infrared photoacoustic spectroscopy of raw coal

Photoacoustic Fourier transform infrared (PA-FT-i.r.) spectrometry was employed to examine raw coal containing 13–64 wt%, daf volatile matter (VM). Sample preparation for i.r. examination was the same as for ASTM proximate analysis. Technological and spectroscopic information on representative samples were obtained. PA scan time is longer than for conventional FT-i.r. operation; however sample preparation is faster and easier. The time-consuming KBr pellet technique, possibly affecting coal structure, is avoided. The i.r. absorption in the OH, NH, CH_ar and CH_x,al regions may allow the determination of VM for both high- and low-rank coal. Some differences between present PA and diffuse reflectance spectra of raw coal from the literature are discussed.     

中国化妆品原料产业界的现状和使命

简要介绍了中国化妆品行业发展情况,特别指出国内原料产业界的发展现状,并就中国化妆品原料产业未来发展提出建议。     

Quantitative determination of ZrC in new ceramic materials by Fourier transform infrared spectroscopy

Zirconium carbide-based biomorphic ceramics have been manufactured by vacuum infiltration of zirconium-oxychloride (ZrOCl₂·8H₂O) sol into natural wood. After vacuum-assisted infiltration, the specimens were dried in air and pyrolysed at 800 °C in Ar-atmosphere. The infiltration and drying process were repeated up to four times. Finally, the specimens were hold at 1550 °C in a vacuum furnace to form ZrC. The results of the process of synthesis have been studied using scanning electron microscopy (SEM). For evaluating the yield of the synthesis, a new method by Fourier transform infrared spectrometry (FTIR) has been developed for the direct determination of ZrC by absorbance measurements in KBr pellets. The procedure was based on the use of the ratio between the absorbance of the characteristic band of zirconium carbide and those of an oxalate internal standard added to samples. A multivariate calibration strategy based on inverse least squares and the standard addition approach was employed for quantification. The results obtained for all ZrC-ceramics studied were satisfactorily compared with those obtained by X-ray diffractometry (XRD). The proposed method was also applied to the analysis of synthetic samples prepared by mixing pyrolyzed wood with ZrC, the results indicated good recovery in all instances.     

化妆品原料中铅、铜、铁和钴的含量调查分析

研究考察了132种不同来源、不同类型的原料,对铅、铜、铁和钴4种元素进行了分析。结果表明,所检测的化妆品原料总体质量较好,上述金属元素含量较低,但不同种类、同一种类不同厂家的原料中,铅、铜、铁和钴含量差别较大。在所有样品中,铁和钴检出率最高,分别为40.2%和20.5%;而烷烃和酚类原料中检出铅的比例最高,分别为33.3%和25.0%。     

Rapid method for determining moisture content in crude palm oil by Fourier transform infrared spectroscopy

A simple, rapid, and direct Fourier transform infrared (FTIR) spectroscopic method was developed for the determination of moisture content of crude palm oil (CPO). The calibration set was prepared by adding double-distilled water to dried CPO in ratios (w/w) between 0 and 13% moisture. A partial least squares (PLS) regression technique was employed to construct a calibration model followed by cross-validation step. The accuracy of this method was comparable to the accuracy of the American Oil Chemists' Society's vacuum oven method, which is used for determination of moisture and volatile matter, with mean difference (MD_a) of 0.0105, a coefficient of determination (R ²) and a standard error of calibration (SEC) of 0.9781 and 0.91, respectively. It is also comparable to the accuracy of the International Union of Pure and Applied Chemistry's distillation method with MD_a, R ², and SEC of 0.0695, 0.9701, and 0.65, respectively. The study showed that midband FTIR spectroscopy combined with the PLS regression calibration technique is rapid and accurate for determination of moisture content of CPO samples with a total analysis time of less than 2 min and less than 2 mL of sample.     

高安全性富勒烯化妆品原料及其美白、抗炎、修复功效

采用物理分散法将富勒烯C60分散于透明质酸钠(HA)或聚乙烯吡咯烷酮(PVP)中,制备了水溶性富勒烯材料,富勒烯透明质酸钠(MHAF60)、富勒烯聚乙烯吡咯烷酮(PPF60),并对其护肤性能进行了测试.UV-Vis和FTIR结果显示,富勒烯C60在MHAF60和PPF60中仍保持了其特征吸收.DLS结果显示,MHAF6...     

高安全富勒烯化妆品原料及其美白、抗炎，修复功效

制备了两种水溶性富勒烯衍生物〔富勒烯透明质酸钠（MHAF60）、富勒烯聚乙烯吡咯烷酮(PPF60)〕,并对其护肤性能进行了测试。UV-Vis和FTIR结果显示,富勒烯依然保持了其特征吸收。DLS结果显示两种材料粒径分别为368.5nm和500.6nm。GC结果表明两种材料均无有机溶剂残留。EPR结果显示MHAF60淬灭自由基的能力要显著优于PPF60、维生素C和水溶性虾青素。以人表皮角质细胞（HEK-A）作为研究对象,测试了在双氧水损伤条件下MHAF60对细胞的修复和保护作用,结果显示MHAF60的效果显著优于维生素C和水溶性虾青素。斑马鱼模型试验结果显示MHAF60具有显著的抑制黑色素、抗炎修复功效,安全性更高。     

陶瓷原料中二氧化硅的快速分析方法

传统方法测定二氧化硅(SiO2)过程烦琐，整个过程需要5h以上。采用本方法后在30min内即可快速、准确地完成，对于指导陶瓷生产具有重要意义。