... theirtotalconcentrations of Ca, Cd,Cu,K,Mg, N,P,PbandZn.Onealiquot of thesampleswasdigested with boiling concentrated HNO3beforedetermination of thetotalconcentration of ... soilsand control soils in the exchangeable(NH4NO3) fraction of these metals (Table 4).The reason of this might be lowconcentrationsincombinationwithavariationbetweenthereplicates.051015202530354045Hanoi ... Post‐irrigation impact of domesticsewage effluent on composition of soils, cropsand ground water‐a case study, EnvironmentInternational28(2002)481.VNUJournal of Science,EarthSciences24(2008)87‐9587Effects of usingwastewaterasnutrientsources on soilchemicalpropertiesinperi‐urbanagriculturalsystemsNguyenManhKhai1,*,PhamThanhTuan2,NguyenCongVinh3,IngridOborn41...