In th is paper, the con ten t of phenacet in in compound tab let s of A sp irin, A n tongding and Keganm ing w ere determ ined in hydrogen ch lo ride acid by spect ropho tom et ry w ithou t any p relim inary separat ion. The po tassiun dich rom ate (0.1molL/L)w as adop ted as co llo r reagen t. The average recoverys and relat ive standard deviat ion s of compound A sp irin, A n tongding and Keganm ing tab let s are 100.6%, 0.355%, 100.1%, 0.263%, 99.27%, 0.598%, respect ively. Th is m ethod is simp le, rap id and w ith sat isfacto ry resu lt s.

对硒-碘化钾-结晶紫-聚乙烯醇显色体系进行了较系统的研究。结果表明，硒在盐酸介质中可与I3离子形成三元缔合物，其缔合物的最大吸收波长为560nm，E为2。31×105，硒含量在0～6μg/25ml范围内服从比耳定律，利用巯基棉分离干扰离子，选择性高，测定海豚肝脏及茶叶中硒含量与加标回收率，结果满意。

Analytical Milli high-speed counter-current chromatography (HSCCC) was used for the selection and optimization of the two-phase solvent system to separate flavonoids from the extracts of the seeds of Oroxylum indicum. The optimum solvent system obtained from Milli-CCC was also the best solvent system for preparative HSCCC and led to the successful separation of two crude flavonoids from the seeds of O. indicum by Lab/Prep (laboratory preparative) HSCCC using different sized coils. Four flavonoids were isolated by preparative HSCCC: baicalein-7-O-diglucoside (25.0mg, 92% purity), baicalein-7-o-glucoside (50.4mg; 95% purity), baicalein (75mg; purity 98%) and chrysin (100 mg; purity 98%).

A highly sensitive spect rophotomet ric method for determination of selenium (Ⅳ) has been developed. It has been based on Se (Ⅳ) oxidation of I-in a weak acid medium and formation of the 1:1 ion-associatin complex of I-with Butylrhodamine B in the presence of poly (vinyl alcohol). The wavelength of maximum absorbance of this complex was at 590nm, The molar absorptivity was 2.57×105L.mol-1•cm-1 and Beer's law was obeyed in the concent ration range of 40～500ng/mL. The detection limit was 40ng/mL. Interfering ions were eliminated by using thiohydroxy cotton so that the selectivity of this method was good. The color system was used to determine the microamounts of Se in the liver of dophine and huangqi. Satisfactory result s were obtained.

有机锗具有提高人体免疫机能、降低血脂、抗癌、防癌及防衰老等多种功能。许多植物如人参、枸杞、茶叶、蘑菇中都含有有机锗，有些含锗食品已被国家批准为新资源性食品并引起人们的重视。对人参、枸杞中锗的测定方法较多，但对蘑菇中锗的测定还未见报道。蘑菇以其味美价廉深受人们喜爱，因此在研究蘑菇中有机锗的化学形态和结构的前提下，准确测定有机锗的含量对于新资源食品开发、利用及监测具有重要的意义。锗的测定方法多采用原子吸收法[1]和分光光度法[2～6]，分光光度法中常采用锗钼杂多酸一碱性染料离子缔和物显色法[1]和荧光酮比色法[4]，但由于铋（Ⅴ）、锑（Ⅲ）、钒（Ⅴ）等干扰元素的存在，两者常需萃取分离后才能测定。我们利用水杨基荧光酮作显色剂，在抗坏血酸、混合表面活性剂、聚乙烯醇存在下形成胶束体系，提高锗一水杨基荧光酮分光光度法的灵敏度，同时也消除了铋（Ⅴ）、锑（Ⅲ）、钒（Ⅴ）等离子的干扰，从而建立了灵敏度较高、选择性较好的测定植物中有机锗含量的方法。用该法测定人参、枸杞、茶叶、蘑菇中有机锗含量，结果满意。