. 2019 Feb 19;11(2):362. doi: 10.3390/polym11020362

Table 2.

Impurities of AH and APS present in PANI extracts after 24 h treatment with ultrapure water at 37 °C determined by HPLC. Results expressed in mg per mL of extract.

Polyaniline Samples	Aniline Hydrochloride [mg mL⁻¹]	Amonium Persulfate [mg mL⁻¹]	Polar Unknown [mg mL⁻¹]
PANI-N	0.32 ± 0.02	29 ± 7	140 ± 4
PANI-M	0.43 ± 0.06	86 ± 16	n.d.
PANI-S	0.39 ± 0.04	178 ± 29	n.d.
PANI-Cl	0.27 ± 0.04	35 ± 8	n.d.
PANI-P	0.07 ± 0.01	9 ± 3	n.d.

Note: n.d., not detected.