分光光度法与激光热透镜光谱分析法测定高散射物质光吸收的比较

通过理论和实验比较了分光光度法与激光热透镜光谱分析法在高散射背景下测量物质光吸收的差异。研究了在不同含量纳米TiO2的散射背景下，散射对分光光度法和热透镜光谱分析法测定耐尔蓝溶液含量的影响。结果表明，分光光度法对具有光散射性质试样的测定存在较大误差，而激光热透镜光谱分析法能较好的避免散射影响，测定结果准确。实验结果与理论分析相一致。     

近场激光热透镜光谱分析法测定铌

采用氦-氖激光器(632．8nm)观测了铌(V)与2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚(5-Br-PADAP)和酒石酸所形成的紫蓝色三元配合物的激光热透镜效应，建立了近场激光热透镜光谱分析法测定铌的新方法。铌(V)质量浓度在0-500ng/mL范围内与热透镜信号强度呈良好的线性关系，检出限为5ng/mL。该方法已应用于钢样及铌矿样中铌的测定。     

激光热透镜光谱分析法同时测定铜、钴和镍研究

基于2-(5-NO2-吡啶-2-偶氮)-1-羟基-8-氨基萘-3，6-二磺酸与铜(Ⅱ)、钴(Ⅱ)和镍(Ⅱ)反应酸度的差异及热透镜信号强度的加和性，建立了激光热透镜光谱法同时测定铜、钴和镍的新方法。测定铜、钴和镍的线性范围依次为0～200ng/mL、0～200ng/mL和0～100ng/mL，检出限依次为2ng/mL，2．5ng/mL和1ng/mL。方法已用于合成样品及人发样中铜、钴和镍的同时测定。     

毛细管微池激光热透镜光谱分析方法研究

采用毛细管为测定微池,研究了毛细管微池激光热透镜光谱分析方法。理论上给出了毛细管微池激光热透镜光谱分析表达式。探讨了毛细管微池光反射的影响及其在光路位置特征、有机溶剂增强效应等。应用毛细管微池激光热透镜光谱分析于钼蓝法测定磷和浊点萃取测定孔雀石绿。结果表明建立的毛细管微池激光热透镜光谱分析方法,具有简单易行、高灵敏度的特点,适用于微量样品的分析测定。该研究不仅对于微量样品的测定具有应用价值,而且对于激光热透镜光谱分析法在绿色分析化学中的应用具有积极的促进作用。     

催化激光热透镜光谱法测定铜

基于铜催化邻苯二胺氧化反应,以激光热透镜光谱法测定微量铜,讨论了测定条件的影响。结果表明,该方法测定灵敏度高,在0．2－1．2μg/L铜（Ⅱ）浓度范围内呈线性关系,重现性及回收率实验均取得满意的结果。     

针剂中多巴胺的近场激光热透镜光谱法测定

基于多巴胺与四氯苯醌荷移反应 ,建立了近场激光热透镜光谱法测定多巴胺的新方法 ,讨论了测定条件的影响 ;结果表明 ,该法灵敏度高 ,多巴胺质量浓度在0.04～2mg·L-1 范围内与信号强度呈线性关系 ,检出限20μg·L-1;应用于药物制剂中多巴胺的测定 ,获得了满意的结果     

激光热透镜分析法测定土壤中水溶性磷

采用激光热透镜分析法进行了土壤中水溶性磷的测定。研究了测定磷的各种影响因素及土壤中水溶性磷的浸提率与固液比和浸提时间的关系，表明聚乙烯醇的存在能增强热透镜信号强度，并使显色体系稳定５ｈ以上。采用该方法进行土壤中水溶性磷的测定，磷含量在１．５～３０μｇ／Ｌ之间与热透镜信号强度成线性关系，检出限为０．３μｇ／Ｌ。为土壤分析中痕量磷的测定提供了一种高灵敏度分析方法。     

光敏分离薄膜激光热透镜光谱法测定微区痕量汞的研究

本文报道光敏分离薄膜激光热透镜光谱法测定微区痕量汞的研究。讨论了汞－双硫腙体系的光敏特性，及其光敏薄膜激光热透镜的产生机理，研究了不同溶剂介质对光敏分离薄膜热透镜信号的影响，采用光敏分离成功地进行了痕量汞的分离测定。     

催化激光热透镜光谱法测定南阳恐龙蛋化石中痕量铱

催化激光热透镜光谱法测定南阳恐龙蛋化石中痕量铱阎宏涛,杨胜科（西北大学化学系,西安,７１００６９）关键词恐龙蛋化石,热透镜光谱法,催化反应,痕量铱的测定近年来,地质学界对白垩－第三纪界线（Ｋ－Ｔ界线）全球性铱的异常给予极大的关注［１］．化石中痕量铱的...     

催化近场激光热透镜光谱法测定痕量铱

将近场激光热透镜光谱分析法与动力学分析法相结合.基于铱(Ⅳ)催化高碘酸钾氧化耐尔蓝A的动力学反心,建立了催化近场激光热透镜光谱法测定痕量铱的新方法,并探讨了反应机理。结果表明:铱浓度在0.05～2.4μg/L范围内呈线性关系;俭出限为6.2 x 10-12g/mL。应用该方法测定矿样中痕量铱.结果满意。     

TiO_2溶胶二级散射光谱法测定人血清白蛋白

制备了TiO2溶胶,并通过透射电子显微镜等对其结构进行了表征。研究了TiO2溶胶与人血清白蛋白(HSA)的相互作用。基于HSA对TiO2溶胶二级散射峰的增强作用,建立了二级散射光谱法测定痕量白蛋白的新方法。方法的线性范围是0.005~1.5 mg/L,检出限为3.5μg/L。方法用于人血中HSA的测定,回收率为98%~100.2%。     

Studies on the effect of surfactants on the extraction rate by laser thermal lens spectrometry

The effect of different kinds of surfactants on the extraction process of Nile Blue-I- was investigated by laser thermal lens spectrometry . It was shown that the surfactants could accelerate or decelerate the extraction rate by varying the extractive's solubility and the interfacial tension of the extraction solution. The higher the concentration of surfactants was, the more obvious the effect.     

浊点萃取-激光热透镜光谱法测定痕量钯

以2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺(5-Br-PADMA)为络合剂,用非离子型表面活性剂Triton X-114浊点萃取样品溶液中的痕量钯。探讨了溶液p H、络合剂用量、平衡温度及时间、表面活性剂用量等实验条件对体系浊点萃取效率及测定灵敏度的影响,并详细研究了多种阴、阳离子对测定的干扰情况。在最佳条件下,钯浓度在4~80 ng·m L-1范围内与热透镜信号强度呈线性关系,方法的检出限为1.2 ng·m L-1,该法用于自来水中痕量钯的测定,加标回收率为95.5~96.7%,相对标准偏差为0.87%~2.49%。     

Determination of catecholamines as aminochromes by micellar liquid chromatography with thermal lens spectrophotometric detection

Summary The determination of catecholamines (CAs) using micellar liquid chromatography with thermal lens spectrophotometric detection has been studied. CAs are oxidized with hexacyanoferrate(III) to aminochromes which are separated with a mobile phase of 0.05 M sodium dodecyl sulphate, 7% propanol and 0.03 M citrate buffer, pH 4.8, on a partially endcapped C₁₈ column. The aminochrome-micelles and aminochrome-stationary phase association constants are evaluated. Using the 488 nm line of an Ar⁺ laser with 250 mW pump power the limits of detection are about 4 ng mL^–1. The technique is applied to the determination of unconjugated CAs in urine using isoproterenol as internal standard.     

Monitoring supercritical fluid extraction by thermal lens spectrometry with pulsed laser excitation

A dual-beam thermal lens spectrometer (TLS) with a pulse pump–probe coaxial configuration was coupled to commercially available supercritical fluid extraction equipment using a high-pressure flow cell interface. Because of its feasible critical parameters, moderate cost and good thermooptical properties, carbon dioxide was used as supercritical solvent. Using trans-β-carotene as analyte, several factors related with the extraction process under continuos flow conditions were studied in order to establish their influence in the thermal lens signal magnitude. Under the optimum experimental conditions, the relative TLS signal area showed a linear relationship with the concentration of trans-β-carotene from 1.5×10⁻⁶ to 8×10⁻⁸ M (n=5, r=0.998) in the supercritical phase. Thus, the viability of on-line detection for supercritical fluid extraction with a pulse thermal lens spectrometer was demonstrated.     

Measurement of bisphenol A in human serum by gas chromatography/mass spectrometry

The purpose of this study is to establish an easy and accurate method for the determination of bisphenol A (BPA) in the human serum. The samples were applied to the C₁₈ solid phase extraction (SPE) column for clean up of samples. The BPA is conjugated with tetrabutylammonium hydrogen sulfate as the counter ion in alkali solution. The ion paired BPA is moves from the aqueous phase to the organic phase as an ion paired extraction. BPA extracted from human serum were derivatized with pentafluorobenzyl bromide (PFBBr). The derivative was analyzed by gas chromatography (GC)/mass spectrometry (MS) using negative chemical ionization (NCI). The instrumental detection limit of BPA was 5 pg/ml (10 fg). The instrumental response between 0.01 and 100 pg/ml of BPA standards was linear (r²=0.998). The recovery of BPA spiked into human serum was 101.0±4.63 (1 pg/ml) and 100.9±3.75 (10 pg/ml), respectively. The concentration of BPA in the human serum from 20 individuals was 0.54 pg/ml.     

流动注射比浊法测定人体血清总蛋白

基于磺基水杨酸 硫酸钠混合试剂与蛋白质发生浊度反应,设计了具有一个汇合点的FIA单道流路,运用正交实验优化了影响比浊反应的主要因素,并探讨了流动注射分析条件,从而提出了流动注射比浊法测定人血清中总蛋白的新方法。本法实验结果与双缩脲法一致,每小时进样60次,线性范围为0.14～1.40mg mL。