Concentration and distribution of some chemicals from soil environment which irrigated by reuse wastewater: case study in Sana’a basin, Yemen

The paper aims to investigate the impact of reuse of wastewater for irrigation purpose on chemical contains of the soil environmentof study area during the year 2015. Nowadaysbecause of the increase in population, the demand for water has increased rapidly, leading to water scarcity and this led to the trend towards the use of wastewater in agriculture to meet the shortfall in the required water for irrigation. The potential threat of heavy metals to human health has led to many studies on permissible levels of these elements in soil. The study conducted on five soil samples at a depth of 20 cm that analyzed for fifteen chemical parameters. During period 1; the results show the maximum values of B, Cu and Pb were 44.248, 27.929 and 5.999 (mg/kg) were from S3, S3, S1 samples respectively.During period 2 and 4; the maximum values of Ba, Cd, Ni, Sn, V, Zn and Cr were 171.965, 27.020, 72.305, 136.649, 72.737, 121.416 and 0,50 (mg/kg) were from S2, S2, S4, S3, S2, S3 and S5 samples respectively. During period3; the results show the maximum values of AS, Mo and Se 6.350, 43.090 and 0.850 (mg/kg) were from S1, S1, S5 samples respectively. The Maximum concentration of CN was during periods 2,3 and 4. Co was not detectable in all samples during four periodswhereas As, B, CN, Mo, Ni, Pb and Se were not detectable during periods 2 and 4. As, B, Ba, Zn, and CN were within the permissible limits during 4 periods while Pb, Se, Cd were within the permissible limits during p1 and p3 and Cu during p1, p2 and p3 and Ni during p1, p3 and p4. Cr was more than the permissible limits during 4 periods while Sn during P2 and P4 and during p1 form S1 and S3 and Mo during p1 and during P1 form S1 and S3 whereas V was more during p2 except S4 and during p3 from S1 and S3 and all the detectable samples duringp4.The studied parameters show more correlations 64 during p3 were less correlations 2 during p4. More correlations of studies were during p3 and less correlation were p4.