dear editor<br />I have questions from your edited document, so can you please answer and check my questions SOON? I need to submit the paper soon by tomorrow morning. thanks<br /><br />
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<li>Comment 4: In the column?</li>
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<p>--&gt; Answer: Yes, I meant in the column, so can I write the sentence as follows?</p>
<p>the tracer (NO<sub>3</sub><sup>&minus;</sup>) were determined by the chromotropic acid method<sup>5</sup> using a DU<sup>&reg;</sup> 720 UV/Vis spectrophotometer (Beckman Coulter, Brea, CA, USA) in a downward direction&nbsp;in the column.</p>
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<li>On page 11, you revised the original sentence (&ldquo;The release of nano-ZnO in sand when it was pre-saturated with siloxane, porous-particle interaction and/or blocking effects appear governing &hellip;.&rdquo;) as follows.</li>
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<p>&ldquo; After the release of nano-ZnO in sand that it was pre-saturated with siloxane, porous-particle interaction and/or blocking effects appear as governing mechanisms responsible for lower elution and higher deposition. &ldquo;</p>
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<p>But your revised sentence doesn&rsquo;t make sense since it does not convey what I want to say.&rdquo; So if I revise it as follows, would this be correct grammatically? Please check.</p>
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<p>&ldquo;In contrast, under the condition where the sand was pre-saturated with siloxane, porous-particle interaction and/or blocking effects appear as governing mechanisms responsible for lower elution and higher deposition of nano-ZnO.&rdquo;</p>
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<li>Also I forgot to include the following sentence and added to the draft. Can you check if the following sentences are correct?</li>
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<p>These results are well supported by the estimated surface coverage (q) between nano-ZnO release of the mixture of siloxane and nano-ZnO from the sand (A), and nano-ZnO release from the sand that was pre-contaminated with siloxane (B). The estimated q values were 5.48 &amp; 5.30 [3 mg/L &amp; 30 mg/L siloxane in (A)], and 8.69 &amp; 7.9 [3 mg/L &amp; 30 mg/L siloxane in (B)], while the q of control (no buffer, only nano-ZnO release from the sand) was 6.85.</p>
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<p>Also, can you check the following sentences that were missed in the previous document?</p>
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<ol>
<li>Describe three primary disinfectants and compare their pros and cons.</li>
<li>Describe lime-soda processes and illustrate their applications.</li>
<li>True or False (1.0 point: 0.2 points per each question</li>
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<p>(1) Increase in the ionic strength of a colloidal suspension will tend to cause destabilization, with consequent coagulation<br /> (2) Coagulating power inversely rises rapidly with its valence</p>
<p>(3) Charge on colloidal surfaces is a function of the type</p>
<p>(4) The addition of polyelectrolytes is to improve the effectiveness of adsorption</p>
<p>(5) Flocculation rate is decreased by the concentration of particles</p>
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