流动注射-分光光度法测定工业废水中的Fe^2＋和Fe^3＋

将Fe^2 与邻菲啰啉的显色反应引入流动注射系统，用盐酸羟胺将Fe^3 预先还原，0～6μg/ml的Fe^2符合比耳定律，检测出限0．11μg／ml。0．25μg／mlFe^2 经5次测定的标准偏差为2．2％，进样频率为120次／h，回收率98．5～104％。对工业废水中铁的测定取得了满意的效果。     

分光光度法测定中药板蓝根中砷含量的方法探讨

对中药材板蓝根中砷含量测定的方法进行探讨。样品经HNO3-H2SO4消解，分光光度法测定回收率，并用该方法对来自不同产地板蓝根中砷的含量进行了测定。结果表明：砷的含量在0-25μg范围与吸光度呈良好的线性关系，r=0.9997,回收率平均值为95.0％。各地区板蓝根中砷的含量参考相关国家标准均未超标。     

用差示分光光度法测定高浓度皮革废水中铬的方法探讨

介绍了应用差示分光光度法直接测定高浓度皮革废水中Cr的方法，通过与原实验方法分析结果的对比，获得了满意的结果，能基本满足环境监测的要求。     

硫氰酸盐-抗坏血酸体系流动注射光度法测定水中钼

建立了水中钼的硫氰酸盐一抗坏血酸体系流动注射分光光度测定法,优化了试验条件。方法在0mg／L～16mg／L范围内线性关系良好,检出限为0．19mg／L,废水样品测定的RSD≤I．6％,加标回收率为96．3％～104％,与国家标准方法的测定结果一致。     

分光光度法测定水稻土中有机酸的研究

本文以三种有机酸为代表,研究并建立了测定水稻土中有机酸的分光光度法。结果表明,三种有机酸的有色络合物具有相同的吸收光谱,且具有相同的最大吸收波长(λ_(mss)=500um)和相近的表观摩尔吸光系数。水分对酯化反应影响很大,含水量达4ml时,吸光值下降85％。酯化温度在10℃以上时,酯化率达最大值且保持稳定。在25℃时,显色反应20min趋干稳定,且在1h内吸光值下降不超过1.2％。土样中的有机酸采用NaCl溶液为提取剂,以3:1的液土比振荡提取30min,NaCl溶液浓度为1％就能达到良好的提取、过滤效果。提取液在烘干前需进行碱化,否则有机酸将损失30％以上。本法平均回收率为92.2％(n=5),标准差为0-0.0478cmol k8~(-1)(n=2-6),平均0.0142cmol kg~(-1)(n=26);变异系数为0—10％(n=2-6),平均4.87％(n=26);线性范围为0—0.0018mol L~(-1)。     

溴酸钾—酸性铬红—CTMAB动力学光度法测定硒的研究

根据痕量硒（Ⅳ）对溴酸钾氧化酸性铬红的褪色催化作用,建立了一种测定硒的新方法。检出限为4μg／L,硒的含量在20～240μg／L内符合比耳定律。方法用于食品中硒的测定,结果满意。     

微波消解-分光光度法测定土壤中的全硼

研究了分光光度法测定土壤中的全硼时样品的微波消解方法.建立了合理的分析步骤.进行了微波消解条件的选择及测定结果精密度、准确度实验.实验结果为:消解完全仅需25min,相对标准偏差7.6%,其方法的加标回收率为98.4%～112%.结果表明,微波消解-分光光度法测定土壤中的全硼是一种快速、准确且低环境污染的方法.     

Biofilms coating Schoenoplectus californicus as indicators of water quality in the Río de la Plata Estuary (Argentina)

N-ethyl-3-carbazolecarboxaldehyde-3-thio- semicarbazone (ECCT) as an new analytical reagent used for the development of a highly sensitive extractive spectrophotometric method for the determination of copper(II). The ECCT forms a greenish-yellow colored 1:1 (M:L) complex with copper(II) at pH 3.0, which is well extracted into n-butanol and shows maximum absorbance at 380nm. The color of the complex is stable for more than forty eight hours. The system obey Beer's law in the range 0.4–3.6 with 2.243 × 10⁴lmol⁻¹cm⁻¹, 2.83 × 10^-3μgcm⁻² molar absorptivity and Sandell's sensitivity respectively. The regression coefficient is 0.412 with 0.99 correlation coefficient. The precision and accuracy of the method was checked by finding the relative standard deviation (0.422%). This developed method has been successfully employed for the determination of copper(II) in environmental and pharmaceutical samples. The method is evaluated by analyzing samples from the bureau of analyzed samples (BCS 233, 266, 216/1, 207 and 179) and by inter comparison of experimental values using AAS.     

甲基紫光度法测定水中十二烷基磺酸钠

在氢氧化钠介质中,基于甲基紫与十二烷基磺酸钠的显色反应,建立了甲基紫光度法测定水中十二烷基磺酸钠的方法,确定了最佳试验条件,试验了共存离子的影响。方法在0mg／L-48mg／L范围内线性关系良好,检出限为0．190mg／L,应用于模拟水样和环境水样中十二烷基磺酸钠的测定,结果与国标方法亚甲蓝法相吻合。     

A sensitive spectrophotometric method for the determination of arsenic in environmental samples

We developed a cost-effective and sensitive spectrophotometric method for the determination of arsenic at trace level using a new reagent, leuco malachite green. Here we show that, arsenic reacts with potassium iodate in acidic conditions to liberate iodine, and the liberated iodine selectively oxidizes leuco malachite green to malachite green dye. We studied the Beer’s law at 617 nm, which showed linearity over the concentration range 0.09–0.9 μg ml⁻¹ of arsenic. We show that the molar absorptivity, Sandell’s sensitivity and detection limit of the method are 6.1 × 10⁴ l mol⁻¹ cm⁻¹, 0.0012 μg cm⁻² and 0.025 μg ml⁻¹, respectively. We applied the developed method for the determination of arsenic in environmental samples.