79592-90-8Relevant articles and documents
NEW PHOTOMETRIC REAGENTS FOR ALKALI METAL IONS BASED ON CROWN ETHER COMPLEX FORMATION
Nakamura, Hiroshi,Sakka, Hideo,Takagi, Makoto,Ueno, Keihei
, p. 1305 - 1306 (1981)
Two chromogenic crown ethers, N-(2-hydroxy-5-nitrobenzyl)-aza-15-crown-5(1) and N-(2-hydroxy-5-nitrobenzyl)-aza-18-crown-6(2), were synthesized for the extraction photometry of alkali metal ions.The extraction selectivity followed the order: 1, Li+>Na+>K+>>Rb+, Cs+ and 2, K+>Na+>Rb+>Li+>Cs+. 1 is useful for determining 10 - 100 ppm Li+ as well as for concentrating Li+ from a dilute solution