在自然界中贵金属元素通常含量很低，在花岗岩矿石中一般只有零点几个ppm。其中Os，Ru，Rh，Ir更少，只有几个ppb

[1]

。因此对微量贵金属元素的测定，需要一种灵敏的分析方法。中子活化分析法是一种很理想的方法，但中子辐照后要进行分离以除去大量的贱金属元素，G. Koster等人

[2]

合成了含有

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功能团的螯合树脂后，G. H. Morrison等人

[3～5]

在贵金属中子活化分析中使用此类牌号为Srafion NMRR的螯合树脂，使复杂的放化分离简化为一步分组分离，结合使用高分辨率Ge（Li）探测器测定各贵金属元素的含量，可用于环境样品中七种贵金属元素的同时测定

[6]

。S. B.Sawin

[7]

和O. ∏. Швoeвa

[8]

分别用光谱法和放射性示踪法对贵金属元素在各种螯合树脂上的浓集和分离进行研究后认为，具有δ-巯基喹啉基团

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的树脂对贵金属吸附效果最好，但对Rh

Ⅲ

和Ir

Ⅳ

的吸附只有在加热下才有明显效果，而且常量组分Fe

+3

、Cu

+2

和Al

+3

对Ir

Ⅳ

的吸附影响比较大。

Two resins with chelating group of

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made by Nankai university were used. Adsorptions of Rhodinium and Iridium on resins were measured unde static conditions at different concentration of HCl at room temperature and 100℃ using

101m

Rh and

192

Ir as indicators. The adsorption reached

>

80% for Rh

III

and

>

90% for Ir

IV

at optimal conditions. It was found that these chelating resins have higher selectivity for noble metals than most of other metal ions. (Al

3+

Fe

3+

Cu

2+

Co

2+

Ni

2+

etc.)