Complex formation of 2-(5-nitro-2-pyridylazo)-5-(N-propyl-N-sulfo-propylamino) phenol with lead, cadmium and manganese for their sensitive spectrophotometric detection in flow injection and ion chromatography systems

Recent developments in the high‐performance chelation ion chromatography of trace metals

“…New reagents, which are derivatives of PAR, like 2-[(5-bromo-2-pyridyl)-azo]-5-diethylaminophenol (5-Br-PADAP) and 2-(5-nitro-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)phenol (Nitro-PAPS) have higher molar absorptivities, approximately 8610 4 and 1.2610 5 L N mol -1 N cm -1 , respectively and could be potentially more suitable in future. They have been used in PCR detection [64,65] and a significant improvement in sensitivity of detection was noted as shown in Fig. 6, but the relatively low solubility of 5-Br-PADAP and high cost of Nitro-PAPS still restrict the wide use of these reagents.…”

“…6, but the relatively low solubility of 5-Br-PADAP and high cost of Nitro-PAPS still restrict the wide use of these reagents. Potentially, even more sensitive reagents could be the porphyrins, e. g., meso-tetrakis(4-N-trimethylaminophenyl)porphine (TTMAPP), which gives molar extinction coefficients for the copper complex of 4.8610 5 L N mol -1 N cm -1 [65]; however, the first attempt of their…”

Highly Sensitive Determination of Cadmium and Lead in Leached Solutions from Ceramic Ware by Graphite Furnace Atomic Absorption Spectrometry Coupled with Sequential Injection-based Solid Phase Extraction Method

“…7 For lead and cadmium determination, the complex formation with 2-(5-nitro-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)phenol and FI-ion chromatography systems were used; the detection limits were 4.8 μg L -1 for lead and 1.9 μg L -1 for cadmium. 8 Spectrophotometry gives lower running cost. However, its sensitivity is not sufficient for trace analysis.…”

Flow-Injection Chemiluminescence Determination of Manganese(II) in Natural Water with Solid Sodium Bismuthate as an Oxidant

“…For such measurements, many methods have been developed. 3 Among all of these, spectrophotometry 4,5 and atomic absorption spectroscopy 6,7 were the routine methods. These methods often suffer from a variety of disadvantages: they could be sophisticated or time-consuming, they could lack enough sensitivity, or they could require expensive instrument.…”