论文部分内容阅读
由表4清楚地表明:1.卟啉类显色剂具有突出的超高灵敏度,采取各种分析于段,选用Soret谱带,其摩尔吸光系数可高达1～31.8×10~5,因此ppb级的金属无须预先浓缩就能测定。这点利用卟啉类显色剂使吸光光度法的灵敏度有了显著提高,常为其它类显色剂所不及(多元络合物除外);2.试剂及其络合物均较稳定,配制的试剂溶液放置数月甚至数年不变质,所形成的络合物在测定条件下至少可2小时,多则24小时以上保持稳定;3.显色反应在室温原来比较缓慢(如TPPS_3与Fe(Ⅱ)的反应就是加热到100℃还得花2.5小时才显色完全),但一般通过加热或其它有效措施均能显著加快速度,甚至快者在室温瞬时即显色完全,能满足分析要求;4.某些试剂和络合物之间的吸
It is clear from Table 4 that: 1. The porphyrin-based developer has outstanding ultra-high sensitivity. The Soret band can be used to analyze various bands. The molar absorptivity can be as high as 1 to 31.8 × 10 ~ 5, and ppb Level of metal without prior concentration can be measured. This use of porphyrin-based chromogenic reagent so that the sensitivity of the spectrophotometry has been significantly improved, often less than other types of chromogenic reagent (except for multiple complexes); 2. Reagents and their complexes are more stable, the preparation of Of the reagent solution for several months or even several years without deterioration, the formation of the complex under the conditions of at least 2 hours, as many as 24 hours or more remained stable; 3. Color reaction was relatively slow at room temperature (such as TPPS_3 and Fe (II) reaction is heated to 100 ° C took 2.5 hours to develop color completely), but generally by heating or other effective measures can significantly speed up, even faster at room temperature instantaneous that is completely color to meet the analysis requirements ; 4 some of the absorption between the reagent and the complex