共查询到16条相似文献,搜索用时 78 毫秒
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在pH6.0的乙酸-乙酸钠缓冲液中,三丁基锡、二丁基锡和一丁基锡有各自的极谱峰电流,但彼此之间存在相互干扰,难以同时进行极谱测定。文中运用偏最小二乘的多元校正能力,对三种丁基锡混合物极谱图进行多元校正,获得了较好的定量分析结果。回收率为96.2%~101.2%,相对标准偏差为3.2%~11.9%。 相似文献
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优化偏最小二乘催化极谱法同时测定发样中Co、Ni、Cr、Zn的研究 总被引:2,自引:1,他引:2
在M273A电化学系统及2.0mmol/LNH4Cl-丁二酮肟体系中采用优化偏最小二乘催化极谱法实现了发样中钴、镍、铬、锌等元素的同时测定,找到了最佳工作条件.方法的准确度和精密度较常规的催化极谱法均有较大提高.钴、镍、铬、锌的线性范围分别为5×10-4~1.0μg/mL、5×10-3~10.0μg/mL、5×10-2~20.0μg/mL、0.1~200.0μg/mL.回收率分别为98%~102%、96%~101%、96%~103%、94%~103%. 相似文献
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模糊聚类-偏最小二乘回归光度法同时测定地质样品中金铂钯铑的研究 总被引:1,自引:0,他引:1
将模糊聚类分析与偏最小二乘法相结合,对地质样品中吸收光谱严重重叠的贵金属多组份体系进行解析,较好地解决了计算光度分析中校准模型的优化问题,使计算结果的精度得到了显著提高,分析结果的相对误差小于
10%,标准偏差小于 0.67,明显优于一般偏最小二乘 (PLS)法。采用小锍试金法消除样品中贱金属元素的干扰,其回收率为
92%~107%,标准偏差为 0.10~0.67;相对标准偏差为 4.7%~11.0%。并对影响聚类效果的参数选择作了讨论。 相似文献
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偏最小二乘法在多组分阳极溶出伏安分析中的应用—铜,锑,铋的同时测定 总被引:1,自引:3,他引:1
本文利用微分脉冲阳极溶出伏安法对微量铜、锑、铋混合溶液进行同进分析,实验在盐酸-氯化钠介质中进行,悬汞电极作工作电极,在-400mV处富集电解5min,然后由-400mV向0V作微分脉冲溶出伏安扫描,扫描速度为2mV/s,脉冲振幅为40mV,由于计算机采集溶出伏安数据后采用偏最小二乘法计算并建立数学模型,然后据此模型对未知溶液进行定量分析,获得了较好的结果。 相似文献
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偏最小二乘光度法同时测定多种酚的研究有应用 总被引:6,自引:0,他引:6
利用Cu(Ⅱ)、吡啶能与酚形成稳定的三元配合物的特点,研究了Cu(Ⅱ)-吡啶-酚三元显色新体系,并以偏最小二乘法建立模型预测,同时测定了模拟水样和环境水样中的对苯二酚、间苯二酚、邻苯三酚和对硝基苯酚,取得满意效果。 相似文献
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《Analytical letters》2012,45(11):2359-2372
Abstract Ternary mixtures of nitrophenol isomers have been simultaneously determined in synthetic and real matrix by application of genetic algorithm and partial least squares model. All factors affecting the sensitivity were optimized and the linear dynamic range for determination of nitrophenol isomers found. The simultaneous determination of nitrophenol mixtures by using spectrophotometric methods is a difficult problem, due to spectral interferences. The partial least squares modeling was used for the multivariate calibration of the spectrophotometric data. A genetic algorithm is a suitable method for selecting wavelength for PLS calibration of mixtures with almost identical spectra without loss prediction capacity. The experimental calibration matrix was designed by measuring the absorbance over the range 300–520 nm for 21 samples of 1–20 µg mL?1, 1–20 µg mL?1, and 1–10 µg mL?1 of m‐nitrophenol, o‐nitrophenol, and p‐nitrophenol, respectively. The root mean square error of prediction for m‐nitrophenol, o‐nitrophenol, and p‐nitrophenol with genetic algorithms and without genetic algorithms were 0.3732, 0.5997, 0.3181 and 0.7309, 0.9961, 1.0055, respectively. The proposed method was successfully applied for the determination of m‐nitrophenol, o‐nitrophenol, and p‐nitrophenol in synthetic and water samples. 相似文献
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偏最小二乘法用于荧光光度法同时测定铈,镨,铽 总被引:9,自引:1,他引:9
本文将偏最小二乘法(PLS)用于荧光光度法同时测定铈、镨、铽。对荧光光度法的测定条件及PLS法中系列校准样品的实验设计及测量波长点的选择等进行了试验和讨论。所建立的方法用于天然混合稀土氧化物中铈、镨、铽的测定,获得较满意的结果 相似文献
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KHAYATZADEH MAHANI Mohamad CHALOOSI Marzieh GHANADI MARAGHEH Mohamad KHANCHI Ali Reza AFZALI Dariush 《中国化学》2007,25(11):1658-1662
Simultaneous determination of several elements (U, Ta, Mn, Zr and W) with inductively coupled plasma atomic emission spectrometry (ICP-AES) in the presence of spectral interference was performed using chemometrics methods. True comparison between artificial neural network (ANN) and partial least squares regression (PLS) for simultaneous determination in different degrees of overlap was investigated. The emission spectra were recorded at uranium analytical line (263.553 nm) with a 0.06 nm spectral window by ICP-AES. Principal component analysis was applied to data and scores on 5 dominant principal components were subjected to ANN. A 5-5-5 (input, hidden and output neurons) network was used with linear transfer function after both hidden and output layers. The PI,S model was trained with five latent variables and 20 samples in calibration set. The relative errors of predictions (REP) in test set were 3.75% and 3.56% for ANN and PLS respectively. 相似文献