Table 6.

Horizontal variations of major, minor and trace elements in fallen dust in El Atwany Village in May 2000

Distance (m)	Fallen dust (g/(m2·month))	Concentration
		SiO2 (%)	Al2O3 (%)	Fe2O3 (%)	CaO (%)	MgO (%)	K2O (%)	Na2O (%)	Mn (×10−6)	Pb (×10−6)	Ni (×10−6)	Co (×10−6)
500	14.0	90.30	0.80	1.20	0.50	0.90	0.60	0.45	530	BD	27.3	BD
1000	15.0	90.80	0.90	0.90	0.43	0.83	0.55	0.38	550	BD	26.6	BD
1500	16.5	91.30	0.90	0.80	0.50	0.63	0.50	0.35	580	BD	20.3	BD
2000	9.0	90.50	0.90	0.70	0.48	0.55	0.45	0.30	420	BD	16.2	BD
2500	8.0	90.20	0.80	0.60	0.43	0.45	0.38	0.25	410	BD	18.3	BD
3000	7.2	90.10	0.75	0.45	0.40	0.33	0.35	0.27	400	BD	16.3	BD
Mean	11.6	90.50	0.84	0.80	0.46	0.62	0.47	0.33	481	BD	20.8	BD

BD: Below detection limit