Table 9.

Percentage of removal of heavy metal to reduce pollution load in the Thamirabarani River surface water with respect to pre-lockdown and lockdown period.

Sampling Point	Pre-lockdown						Lockdown
	% of heavy metal removal required						% of heavy metal removal required
	As	Cr	Cu	Zn	Cd	Pb	As	Cr	Cu	Zn	Cd	Pb
TSW 1	77	a	a	a	a	29	59	a	a	a	a	a
TSW 2	87	a	a	a	a	41	74	a	a	a	a	a
TSW 3	82	38	a	a	a	a	82	29	a	a	a	a
TSW 4	77	a	a	a	a	a	70	a	a	a	a	a
TSW 5	88	29	a	a	a	44	76	1	a	a	a	a
TSW 6	82	a	a	a	a	a	73	a	a	a	a	a
TSW 7	71	a	a	a	a	a	71	a	a	a	a	a
TSW 8	44	a	a	a	a	33	15	a	a	a	a	a
TSW 9	15	a	a	a	a	38	a	a	a	a	a	a
TSW 10	82	a	a	a	a	17	69	a	a	a	a	a
TSW 11	84	a	a	a	a	47	69	a	a	a	a	a
TSW 12	88	29	a	a	a	44	76	1	a	a	a	a
TSW 13	89	a	a	a	a	17	89	a	a	a	a	a
TSW 14	85	1	a	a	a	a	82	a	a	a	a	a
TSW 15	84	38	a	a	a	a	83	1	a	a	a	a
TSW 16	54	17	a	a	a	a	37	17	a	a	a	a
TSW 17	89	1	a	a	a	17	89	a	a	a	a	a
TSW 18	90	38	a	a	a	9	90	17	a	a	a	a
TSW 19	85	17	a	a	a	9	82	1	a	a	a	a
TSW 20	89	17	a	a	a	17	88	1	a	a	a	a
Permissible toxicity load (mg/l)	16.76	57.45	1610	2739	3.95	15.31	16.76	57.45	1610	2739	3.95	15.31

^aDenotes that those samples are within permissible toxicity load.