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Journal of Sensors
/
2016
/
Article
/
Fig 2
/
Research Article
Water Soluble Cationic Porphyrin Sensor for Detection of Hg
2+
, Pb
2+
, Cd
2+
, and Cu
2+
Figure 2
Absorption spectra of
1
(5 × 10
−6
M) in H
2
O.