**3.4 Indices of pollution**

### *3.4.1 Index of geoaccumulation*

**Table 8** shows the Igeo of sampled soil of the two sites. The Igeo showed site F was practically uncontaminated with Cd (average Igeo = −1.58) and Cr (average Igeo = −1.07) but moderately polluted with Cu (average Igeo = 0.53) and Pb (average Igeo = 0.76). At site H, Igeo showed moderate to strong pollution with Cd (average Igeo = 2.16) and Pb (average Igeo = 2.64), a practically unpolluted soil with Cr (average Igeo = −2.72), and Cu (average Igeo = −1.63). Site H appears more contaminated than site F, probably due to its use as a burning and dumping site for e-waste materials.

*Heavy Metal Pollution Resulting from Informal E-Waste Recycling in the Greater Accra Region… DOI: http://dx.doi.org/10.5772/intechopen.112397*


### **Table 8.**

*Igeo of selected heavy metals at sampled sites F and H.*


### **Table 9.**

*CF and PLI of selected heavy metals at sampled sites F and H.*

### *3.4.2 Contamination factor and pollution load index*

**Table 9** provides information on the two sites' CFs and PLIs. The CF values showed site F was moderately contaminated with Cd (average CF = 1.30) and Cu (average CF = 2.55), less contaminated with Cr (average CF = 0.86), and considerably contaminated by Pb (average CF = 3.85). At site H, CF showed very high

contamination of the soil with Cd (average CF = 13.80) and Pb (average CF = 17.07), no or low contamination of the soil with Cr (average CF = 0.24), moderately contaminated soil with Cu (average CF = 1.08). Again, results show more contamination at site H than at site F, possibly because of the dumping activities and the open burning.

The PLIs of both sites were found to be moderately polluted, with respective average values of 1.47 and 2.16 at sites F and H.
