Two-Phase Dechlorination/Detoxification of Lindane (Hexachlorocyclohexane)

Table 1

Dechlorination of lindane.

Organic species		Yield (%) at temperature
		40°C	60°C	70°C	80°C	90°C	110°C
Phase-1		52	38	22	5	16	25
		48	36	28	8	18	42
		—	26	43	62	48	27
		—	—	07	25	18	06
Net dechlorination (Phase-1)		32%	46%	60%	78%	67%	56%
Phase-2				10	2	7	11
				26	32	32	28
				24	18	20	25
				5	4		2
				6	8	6	2
				6	5	4	14
				18	26	22	12
				5	4	9	6
Net dechlorination (Phase-2)				8%	17%	10%	7%
Overall dechlorination = 78% + 17% = 95%

(Phase-1): lindane (2.85 g), Devarda’s alloy (0.5 g), sodium borohydride (0.7 g) in water, heating time 40 minutes; (Phase-2): reaction mixture of Phase-1, Ca(OH)₂ (3 g), sulfur (5 g), heating for 30 minutes.