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¡°Zeta potential measurements are problematic. Most zp measurements in the literature (Sabah and Celik, 2007) gives an iep of around 6. If at all, since this sample contains considerable amount of calcite, it should shift it even to higher pH levels. The zp profile shown in Fig. 4 resembles a typical of excess amounts of silica. Is it so, or else, what is the reason for such a low iep value? On the other hand, since there is a considerable amount of iron in the system, the effect of iron depending on its form should be used in the interpretation of zeta potentials.¡±
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¡°Langmuir model parameters in Table 3 do not mean much unless they are compared with other literature data for similar materials but under comparable conditions. The authors must present such a comparison table keeping in mind the importance of equivalent solid to liquid ratio or solids loading.¡±
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