Recycling of Oily Sludge as a Roadbed Material Utilizing Phosphogypsum-Based Cementitious Materials

Table 6

Sample leaching test results.

Sample	Ba (mg/L)	Cu (mg/L)	Zn (mg/L)	Cr (mg/L)	Ni (mg/L)	Pb (mg/L)
P1	0.921	0.210	0.235	0.067	0.214	0.211
P2	0.522	0.154	0.117	0.035	0.124	0.196
P3	0.174	0.084	0.083	0.032	0.078	0.316
P4	1.140	0.321	0.287	0.098	0.188	0.285
P5	0.535	0.132	0.142	0.055	0.152	0.253
P6	0.255	0.112	0.114	0.044	0.113	0.344
Limits	100	100	100	5	5	5