Distribution Pattern of Metals in Atmospheric Settling Dust along Roads in Kano Metropolis, Nigeria

Table 2

Concentrations (μgg⁻¹) of metals in samples collected from different sites across the seasons.

Metal	SN	Site										Control
		1	2	3	4	5	6	7	8	9	10
Cd	A	4.89	5.74	2.89	10.80	10.49	8.9	6.68	13.93	8.77	12.88	0.00
	B	9.49	10.81	5.27	20.39	18.84	15.38	11.89	26.00	15.27	19.70	0.00
	C	12.01	13.58	7.06	24.82	25.18	19.55	14.92	32.95	20.72	25.85	0.00
	D	2.76	3.39	1.53	7.59	6.86	6.43	5.30	8.81	5.59	8.69	0.00
Cr	A	19.78	36.96	61.28	33.89	29.53	20.00	24.67	38.85	87.79	28.14	0.00
	B	19.78	56.57	44.50	47.79	29.96	42.13	47.07	171.46	151.82	52.92	0.01
	C	24.57	70.98	98.28	66.85	36.90	43.69	67.62	220.76	188.52	64.94	0.00
	D	8.74	27.61	22.06	21.55	19.95	16.80	19.96	72.58	67.94	20.73	0.00
Ni	A	134.75	71.91	80.67	66.83	90.69	79.82	66.88	72.88	46.54	121.14	0.01
	B	236.61	34.66	43.73	26.27	72.29	49.89	129.13	183.88	64.80	86.65	0.00
	C	327.14	47.98	53.85	37.63	99.67	88.86	196.65	237.54	94.64	121.52	0.00
	D	254.85	38.81	47.55	38.00	47.10	35.96	166.95	172.69	89.50	74.78	0.00
Pb	A	133.71	167.49	189.05	129.13	188.89	156.77	215.39	213.76	161.23	219.52	0.00
	B	90.35	135.22	151.23	218.58	1068.01	118.97	137.60	135.06	143.22	164.08	0.00
	C	127.53	182.75	196.28	291.10	1408.57	178.77	253.69	247.86	197.24	254.98	0.00
	D	61.59	80.89	95.18	121.79	640.68	75.80	78.12	78.62	86.52	101.98	0.00
Cu	A	26.51	50.71	44.51	55.10	56.21	71.54	131.64	36.71	36.59	37.44	0.00
	B	16.15	39.16	40.21	205.21	57.34	61.95	116.76	31.66	30.54	25.05	0.00
	C	20.54	53.87	51.28	267.39	66.32	81.84	149.28	41.05	40.19	31.47	0.00
	D	13.30	23.91	21.51	98.62	31.72	36.70	64.79	17.71	18.25	16.61	0.00
Zn	A	153.98	295.82	259.85	507.07	429.23	372.08	192.13	2028.42	675.45	213.49	0.10
	B	2312.28	11711.20	2371.19	10892.70	9435.83	7999.74	5694.99	23515.52	14673.83	7405.33	0.28
	C	2083.70	8781.65	2263.52	8451.63	7135.12	6354.11	4932.63	17401.77	11204.80	5506.89	0.28
	D	211.52	1261.07	201.82	1211.31	883.05	741.49	608.18	3152.32	1493.91	770.06	0.32

SN: season; A: cool and dry season; B: hot and dry season; C: warm and wet season; D: warm and dry season.