Table 5 Peroxide values (meq/kg oil) of different treatments from PSCE during 20 days at 63 °C

0.093 ± 0.00^Fa

5.65 ± 0.13^Ea

11.05 ± 0.30 ^Da

13.92 ± 0.42^Ca

20.15 ± 0.646^Ba

28.45 ± 0.97^Aa

0.065 ± 0.00^Fb

1.35 ± 0.03^Eh

4.40 ± 0.30^Dg

7.85 ± 0.24^Ch

10.79 ± 0.347^Bfg

12.82 ± 0.438^Ae

0.063 ± 0.00^Fb

1.20 ± 0.03^Ei

4.17 ± 0.11^Dg

7.60 ± 0.41^Chi

10.34 ± 0.332^Bgh

12.24 ± 0.42^Aef

0.045 ± 0.00^Fg

5.05 ± 0.11^Eb

7.36 ± 0.20^Db

9.56 ± 0.29^Cb

13.28 ± 0.417^Bb

16.45 ± 0.46^Ab

0.043 ± 0.00^Fh

3.95 ± 0.09^Ec

6.53 ± 0.30^Dc

8.92 ± 0.20^Ccde

12.42 ± 0.399^Bbc

16.05 ± 0.55^Abc

0.005 ± 0.001 ^fg

3.55 ± 0.09^Ed

6.15 ± 0.27^Dcd

8.66 ± 0.26^Cdef

12.19 ± 0.392^Bbcd

15.79 ± 0.54^Abc

0.055 ± 0.01^Fcd

2.53 ± 0.06^Ee

5.82 ± 0.16^Dc

9.33 ± 0.38^Cbc

12.58 ± 0.404^Bbc

15.96 ± 0.34^Abc

0.056 ± 0.001^Fc

1.95 ± 0.04^Eg

5.17 ± 0.15^Def

8.52 ± 0.36^Cef

11.97 ± 0.385^Bcde

15.60 ± 0.53^Abcd

0.053 ± 0.00^Fde

1.93 ± 0.04^Eg

5.35 ± 0.15^Def

8.42 ± 0.25^Cefg

11.84 ± 0.48^Bdec

15.08 ± 0.51^Acd

0.054 ± 0.05^Fcde

3.55 ± 0.08^Ed

6.05 ± 0.17^Dd

9.29 ± 0.28^Cbc

12.30 ± 0.295^Bbcd

15.84 ± 0.54^Abc

0.053 ± 0.00^Fde

1.95 ± 0.04^Eg

5.40 ± 0.15^De

8.40 ± 0.31^Cfg

11.50 ± 0.37^Bde

15.09 ± 0.42^Abc

0.055 ± 0.00^Fcd

2.15 ± 0.05^Ef

5.17 ± 0.15^Df

7.93 ± 0.24^Cgh

11.23 ± 0.36^Bef

14.64 ± 0.50^Ad

0.050 ± 0.00^Ff

2.25 ± 0.05^Ef

5.15 ± 0.16^Def

7.09 ± 0.21^Cij

9.06 ± 0.20^Bh

12.85 ± 0.44^Ae

0.052 ± 0.00^Fe

2.15 ± 0.05^Ef

4.25 ± 0.12^Dg

6.80 ± 0.31^Cij

8.92 ± 0.29^Bhi

11.54 ± 0.19^Afg

0.056 ± 0.00^Fc

1.87 ± 0.04^Eg

3.85 ± 0.11^Dh

6.66 ± 0.20^Cj

8.64 ± 0.18^Bi

11.20 ± 0.38^Ag