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Table 4 The TSI values for chromium (III) oxide suspensions in the absence and presence of polyaspartic acid and polylysine (c = 100 ppm)

From: Application of the zeta potential measurements to explanation of colloidal Cr2O3 stability mechanism in the presence of the ionic polyamino acids

System TSI
pH = 4.0 pH = 7.6 pH = 10.0
Cr2O3–NaCl 55.93 62.91 49.82
Cr2O3–ASP 6,800 27.82 13.88 15.29
Cr2O3–ASP 27,000 19.14 13.22 11.94
Cr2O3–LYS 4,900 16.59 14.23 53.64
Cr2O3–LYS 33,000 17.24 14.18 23.24