Table 3. Effect of Temperature on the Molar Extinction Coefficients.

	temperature
wavelength (nm)	20 °C	25 °C	30 °C	35 °C	effect of temp. (1/°C)
Molar Extinction Coeffient for I2 (ε2, M–1cm–1)a
430	543	540	536	531	–0.15%
456	724	717	711	703	–0.19%
460	729	722	715	708	–0.19%
466	723	717	711	704	–0.18%
469	715	709	704	697	–0.17%
470	712	706	700	694	–0.17%
476	685	680	676	670	–0.15%
Molar Extinction Coefficient for I3– (ε3, M–1cm–1)b
430	2444	2484	2525	2569	0.34%
456	1145	1171	1195	1222	0.44%
460	997	1022	1045	1070	0.48%
466	797	819	840	863	0.53%
469	709	730	749	771	0.57%
470	682	703	722	742	0.58%
476	538	556	573	592	0.64%

^aA solution containing 0.0563 g iodine flake in 1 L.

^bA solution containing 0.527g I₂ flake and 35.542 g NaI in 1 L.