再生纤维素荧光膜

由纤维素铜氨溶液与钒磷酸钇：铕，铝酸钡镁；铕，硫化锌镉：铜和硅酸锌：锰荧光粉混合分别制备了４种再生纤维素荧光膜，研究了这些膜的荧光光谱，相对荧光强度，结晶度及力学性能变化。实验结果表明当添加５％荧光粉时，含钒磷酸钇：铕，铝酸钡镁：铕和硫化锌镉：铜的膜仍保持光粉的结晶峰，在紫外光照射下分别发出红，蓝，黄荧光，其相对荧光强度依次为８１％，７９％及７４％。当膜含５％硅酸锌：锰时，在紫外光照射下发射微弱的     

23种中国和法国小麦样品及小麦面粉样品的九种元素的分析

通过采电电感耦合等离子发射光谱对10种法国小麦样品、2种中国小麦样品、7种法国小麦面粉样品以及4种中国面粉样品进行了钙、镁、锌、铁、锰、铜、钼、钾及磷共9种微和常量元素的含量分析.结果表明:小麦样品中元素含量最高的为磷、钾和镁,其次为钙、铁、锌、锰、铜和钼.小麦面粉样品中元素含量最高的为磷、钾、钙和镁,其次为铁、锌、锰、铜和钼.法国小麦样品中的1号样品(TREMIE)是居第一位的含微量元素量较高的小麦品种,中国小麦面粉样品的11号样品(标粉)是居第一位含微量元素较高的小麦面粉样品.其中对人体有益的元素远远不能满足人体的需要.     

中草药及其生长土壤中6种重金属元素含量相关性初探

采用电感耦合等离子体原子发射光谱法测定了中草药中重金属元素(铁、锰、铜、锌、镉、铅)的含量,并对中草药的生长环境土壤中重金属元素的化学形态及其分布进行了研究。文中提出了中草药样品用硝酸-过氧化氢-水(5+2+1)混合溶液消解,并叙述了土壤样品中元素的各种形态(水溶态、可溶态、碳酸盐结合态、铁锰氧化物态、有机质结合态)的提取方法和试液。结果表明:所测中草药中重金属元素含量明显低于土壤中元素的含量;土壤中铁、锌、铜主要以有机质结合态存在,锰以铁锰氧化物态为主。几种药材中均含有较高量的铁、锰、锌,土壤中也含有较高量的有效态铁、锰、锌,说明中草药与土壤中重金属之间存在有生物迁移作用。     

氧化还原滴定法测定工业硫化锌的含量

利用氧化还原滴定法测定工业硫化锌的含量,分析了影响硫化锌含量测定的因素,样品测定实验结果表明,该法样本合并标准偏差Sq=0.137%,标准回收率为98．99％－100．20％。     

微波消解-火焰原子吸收光谱法测定饲料中铁铜锰锌

铁、铜、锰和锌是饲料中重要的营养元素，其含量的测定已有标准方法，该法虽有较高的灵敏度，但分析时间冗长，试样的灰化就需16h，很难满足批量样品测定的需要。本文采用微波技术消解饲料样品，用火焰原子吸收光谱法测定铁、铜、锰和锌的含量，方法快速、灵敏、准确、操作简便。试样前处理仅需0．5h，节省了分析时间，应用于样品的分析，结果满意。     

石墨炉原子吸收法测定肼类推进剂叶九种金属杂质

建立了石墨炉原子吸收法测定肼类推进剂中锌、铁、铬、锰、铅、镍、铝、铜、钛等金属含量的检测方法，无需样品预处理过程，灵敏度高且快速、准确。各元素测定方法的精密度小于10％，回收率在82％－116％之间。     

微量进样—火焰原子吸收法连续测定牧草样品中微量元素的研究

采用微量增样－火焰原子吸收法连续测定了牧草样品中微量元素铁、锰、锌、铜、钼和钴。实验表明，该法具有灵敏度、精密度高，选择性好，试剂消耗量小，快速、经济等优点。本法测定微量元素铁、锰、锌、铜、钼和钴的回收率均在９１．５％～１０４．６％之间，变异系数均小于４．１％。     

掺锰氢氧化镍的结构与电化学性能

采用化学共沉淀法制备了锰取代的氢氧化镍样品，应用XRD技术对不同锰含量样品的相结构进行了表征，并用恒电流充放电、电流脉冲弛豫法和电化学阻抗技术研究了样品的电化学行为. XRD结果显示：锰含量少于20％时，样品主要由β相组成；而当锰含量达到28.3%时，可以得到具有纯α相结构的样品. 电化学研究结果表明：掺锰的氢氧化镍样品具有优良的电化学循环稳定性；锰的掺杂提高了氢氧化镍电极的析氧电位，增大了样品的质子扩散系数； 具有较低锰含量的氢氧化镍样品显示了较大的放电容量和较高的放电电位.     

火焰原子吸收光谱法连续测定菠萝中的铜、锌、铁、锰

探讨了用微波消化罐消化样品、以火焰原子吸收光谱法在同一体系中测定菠萝中微量元素铜、锌、铁、锰的方法。考察了硝酸、过氧化氢的不同用量以及消化时间长短的影响和在同一体系中钢、锌、铁、锰的彼此干扰情况。在选定条件下，检测限铜为0．0060μg/mL、锌为0．0074μg/mL、铁为0．0040μg/mL、锰为0．0090μg/mL，相对标准偏差1．9％-4．7％，回收率93．2％-105％。     

EDTA滴定法测定再生锌原料中的锌含量

采用氟化铵-盐酸-硝酸-硫酸分解样品,氨水沉淀分离铁、锰、铅等共存元素,滤液中加入掩蔽剂掩蔽少量干扰元素,在pH=5～6的乙酸-乙酸钠缓冲溶液中,以二甲酚橙为指示剂,用EDTA标准滴定溶液滴定。测得结果为锌、镉合量,扣除镉量,即为锌量。方法用于测定再生锌原料中锌,结果的相对标准偏差(RSD,n=11)为0.15%～1.0%。按照实验方法对再生锌原料样品进行加标回收实验,回收率为99.1%～102%。能满足日常对再生锌原料中锌含量的检测要求。     

原子吸收法测定植物中微量金属元素

探讨了一种快捷有样品预处理方法,即采用取四氟乙烯高压罐微波消化法处理样品。通过正交试验分析得到较优的消化条件,并在此条件下做锌、铁、锰的加标回收试验,得回收率分别为９７．０％、９４．３％、９０．６％,相对标准偏差１．２％、４．１％,３．４％。另外,还做了扩展试验,与国标法对照的试验。通过试验和比较,证实该消化方法具有安全、省时、方便等优点。     

Rapid and simple method for the determination of copper, manganese and zinc in rat liver by direct flame atomic absorption spectrometry.

An acidic homogenate method, which includes simple homogenization pre-treatment of tissue material and direct nebulization flame atomic absorption spectrometry (FAAS), is successfully applied to the simultaneous determination of copper, manganese and zinc in rat liver. The proposed method involves only a few steps for sample pre-treatment at room temperature, making the risk of systematic errors very small. Because recoveries of 101% for copper, 98% for manganese and 100% for zinc could be achieved using aqueous standards, matrix-matched standards were redundant. Favourable results obtained in biological media, including limits of detection of 0.04, 0.03 and 0.04 mg l-1 for Cu, Mn and Zn, respectively, together with accuracies of 0-3%, and relative standard deviations ranging from 2 to 10% are further evidence of the suitability of the method.     

火焰原子吸收光谱法连续测定辣椒中的铜、锌、铁、锰

研究了辣椒中金属元素的含量和火焰原子吸收光谱法在同一体系中测定辣椒中微量元素铜、锌、铁、锰的方法,考察了硝酸、过氧化氢的不同用量的影响和在同一体系中铜、铁、锌、锰的相互干扰。为其进一步利用提供了一定依据,取得了较理想的效果。     

测定电解锰中微量铁的 FAAS法——采用 EDTA作释放剂

用盐酸溶解试样,加入EDTA等螯合剂作释放剂,通过改变燃烧器高度调整原子蒸气的温度以消除99．8％以上基体锰的干扰,然后用原子吸收光谱法直接测定电解锰中微量的铁,获得了满意的结果。其标准曲线法、标准加入法的结果相吻合,样品加标回收率99．8％,相对标准偏差为3．1％。方法简便快速,适于工厂的快速分析。     

花椒中五种微量元素含量的测定

采用原子吸收光谱法,测定了河南太行山区花椒及椒皮、椒籽中锰、铁、铜、锌、铅的含量。结果显示,各元素在实验范围内,线性关系良好,回收率在92%~103%之间。花椒及椒皮、椒籽中均含有微量元素,花椒中锰、铁、铜、锌、铅的含量分别为78.851、90.868、11.571、18.818、0.086μg.g-1,其中锰、铁含量丰富,有害元素铅的含量极低。椒籽中铁、铜、锌的分布量大于椒皮;椒皮中锰的分布量大于椒籽。为探讨花椒的高药用价值提供了有力的证据,椒籽中铜、锌、铁含量高于椒皮,应大力开发利用。     

Determination of selenium, zinc and cadmium in antidandruff shampoos by atomic spectrometry after microwave assisted sample digestion

Microwave assisted pre-treatments for atomic spectrometric determination (inductive coupled plasma-optical emission spectrometry, ICP-OES or flame atomic absorption spectrometry, FAAS) of metallic elements, usually present in antidandruff shampoos, are proposed. They are based on the digestion of the sample with HNO₃ into a closed reactor, which is irradiated at 800 W for a few minutes. Selenium was determined by ICP-OES. The limit of detection was 0.11 mg l⁻¹; the relative standard deviation (R.S.D.) for the selenium content in the samples was in the 0.6–3.6% range. The results obtained were in agreement with the label contents and the recovery of the proposed method was in the 100–106% range. Zinc and cadmium were determined by FAAS. The limit of detection for zinc determination was 0.078 mg l⁻¹; the R.S.D. for zinc contents was in the 0.8–8.6% range. A limit of detection of 0.09 mg l⁻¹ was obtained for cadmium determination; the R.S.D. for cadmium contents was in the 0.7–2.7% range. The determinations were performed after two different sample mineralization pre-treatments — dry ashing (in an electric furnace) and wet mineralization (in a microwave oven). Both methodologies provided comparable results for zinc and cadmium determination in shampoos. The proposed microwave assisted digestion procedures allow a precise and accurate determination of selenium, zinc and cadmium in commercial antidandruff shampoos, and the sample pre-treatment is less time-consuming than the classic methods.     

Quantitative estimation of constituents in fly ash by lithium tetraborate fusion

Silica is removed from fly ash sample by hydroflourination for its effective determination gravimetrically and the remaining residue is subjected to lithium tetraborate (Li₂B₄O₇) fusion followed by dissolution in dilute nitric acid to obtain a clear solution in which elements including aluminum (Al), iron (Fe), calcium (Ca), magnesium (Mg), sodium (Na), potassium (K), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), nickel (Ni), copper (Cu) and zinc (Zn), have been determined by Flame Atomic Absorption Spectrometry (FAAS). Two fly ash samples analyzed by the proposed method have been received from the National Council of Cement and Building Materials (NCCBM), India (proposed CRM in future) and fly ash CRM 1633 (b) from NIST, USA. The validity of the method has been established by analyzing fly ash CRM 1633 (b) as reference standard. The standard deviation has been calculated for each measurement.     

Development of a new sequential injection in-line cloud point extraction system for flame atomic absorption spectrometric determination of manganese in food samples

A preconcentration method for manganese determination by sequential injection cloud point extraction with subsequent detection by flame atomic absorption spectrometry (FAAS) has been developed. The enrichment of Mn was performed after a preliminary on-line cloud point extraction and entrapment of manganese-containing surfactant aggregated within a minicolumn packed with cotton. The laboratory-made reagent 4-(5′-bromo-2′-thiazolylazo)orcinol (Br-TAO) and the surfactant Triton X-114 were used for cloud point extraction. The manganese ions were eluted with sulphuric acid solution and directly introduced into the FAAS. Chemical and flow variables affecting the preconcentration were studied. Using a sample volume of 2.80 mL the limit of detection and enrichment factor were calculated to be 0.5 μg L⁻¹ and 14, respectively. The sample frequency is 48 h⁻¹, considering a total run cycle of 75 s. The accuracy of the proposed method has been demonstrated by the analysis of the certified reference biological materials rice flour and tomato leaves. The method has been applied to determination of manganese in food samples.     

火焰原子吸收光谱法快速测定水性漆中镉

研究了水性漆中镉的原子吸收法分析。采用干灰化法处理漆片试样,硝酸消解,ＦＡＡＳ测定,加标回 在８７．８￣９６．４％     

火焰原子吸收光谱法测定锌锭中铅铁镉铜

研究了有机试剂丙酮对火焰原子吸收光谱法测定锌锭中各元素的增敏作用,建立了混合酸直接溶样,丙酮为增敏剂,测定各种牌号锌锭中铅、铁、镉、铜的方法。试验结果表明,该方法简单、快速、准确、可靠。