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近年来,Kolthoff地丹黄法(Titan yellow)已被广泛地应用于血漿、植物材料、土壤、肥料、药物、煤灰、硅酸鹽类矿物、球墨鑄铁及工业用水中微量鎂的測定。根据Ludwig等文献所載,在測定中常加入适量淀粉溶液作为保护膠,因而光学密度和濃度成直綫关系的部分可延至鎂量較高的部位,否则鎂的沉淀色料甚易凝聚而析出。但以淀粉溶液作保护膠的缺点很大,不但需临用时重新配制,在配制时,又常混濁不清,而影响結
In recent years, Titan yellow from Kolthoff has been widely used in the determination of trace magnesium in blood plasma, plant material, soil, fertilizer, medicine, coal ash, silicate minerals, ductile iron and industrial water. According to Ludwig et al., An appropriate amount of starch solution is often added as a protective colloid in the measurement. Therefore, a part of the linear relationship between the optical density and the concentration can be extended to a portion with a higher magnesium content, or magnesium precipitates tend to aggregate and precipitate easily. However, starch solution for the protection of plastic great shortcomings, not only need to be re-formulated when in use, when the preparation, and often cloudy, and the impact of knot