dear editor,<br /><br />I have questions regarding your edited document today.<br />Please answer to my questions as soon as you can (hopefully this morning so that I can revise the paper soon).<br /><br />Question 1: In the abstract - in the following sentence, I think "to" is not necessary since I do not find any verb, is this right? please confirm this. Should I delete "to" or not?<br /><br />--&gt; "In view of these concerns, identifying and confirming TiO<sub>2</sub> NPs derived from consumer products in comparison to the industrial types of TiO<sub>2</sub> NPs need <strong>to</strong> at the forefront of exploring the significance of their release and resultant impacts on the environment.&nbsp;"<br /><br />Question 2: In the abstract - In the following sentence, I used only one sunscreen and one toothpaste (it was not multiple sunscreens and toothpastes). In this case should I delete the "s"? I mean, should it be plural when we describe sunscreen and toothpaste, in general? Also I used one type of industrial TiO2 and so I think the "s" need to delete, is this right?<br /><br />Please clarify this<br /><br />--&gt; Our results indicate that nano-TiO<sub>2</sub> sunscreen<strong>s</strong> and toothpaste<strong>s</strong> exhibit more toxicity compared to industrial type<strong>s</strong> of TiO<sub>2</sub>, and the inhibited growth of <em>T. pseudonana</em> was proportional to the concentrations of nano-TiO<sub>2</sub> irrespective of the types of TiO<sub>2</sub>.&nbsp;<br /><br />Question 3: In the introduction (page 3) - in the following sentence, the word " reportedly" seems to be odd, why did you add this word? should it be deleted? or it should be something like, ".... was reported primarily to exhibit as a rutile....", please let me know. I don't understand your editing here.<br /><br />--&gt; The nano-TiO<sub><span style="font-size: small;">2</span></sub> widely used in sunscreens was <strong>reportedly</strong> primarily exhibited as a rutile crystal form rather than the crystal structure of anatase (found mainly in industrial type), with a needle or near-spherically shaped smaller size (&lt; 20 nm) and often had silica and alumina as coating materials. <br /><br />Question 4: page 4 (introduction), in the following sentence,&nbsp;"it"&nbsp;doesn't make sense. I think it should be either "its" or "their", maybe "their" or "the", in my opinion.<br />Please confirm which one is correct. And also, instead of "because of" I think "from" is better since I tried to say the effect of nanoparticles' release is from our daily consumer and manufacuring of TiO2.., please confirm if "because of" is suitable to say in the sentence.<br /><br /><br />--&gt; Regardless of the physicochemical properties of TiO<sub><span style="font-size: small;">2</span></sub>, its release into an aquatic environment and <strong>it</strong> subsequent effects are likely to be inevitable because of manufacturing and our consumption of nano-TiO<sub><span style="font-size: small;">2</span></sub> products.<br /><br /><br />Question 5: page 4 (introduction), in the following sentence,&nbsp;"cadmium", doesn't make sense.&nbsp;It indicates nanoparticles - let me explain this, since nanoparticles have smaller size with larger surface areas, the nanoprticles have capacity to strongly adsorb heavy metal, such as cadmium. So in this case, what I should write, for example...<br />...owing to TiO2-NPs' physicochemical properties (small size, large...)? or should I write it as ..."owing to their physicochemical properties..., which "their" refers to TiO2.."<br />Please confirm this.<br /><br />Also, ...only end up.." looks odd too. I meant to say, nano-TiO2 is transported and the transported NPs will end up accomulated in marine organisms. Please revise the sentence according to "what I meant to say".<br /><br />--&gt; As an example, cadmium was found to adsorb strongly onto nano-TiO<sub><span style="font-size: small;">2</span></sub> owing to <strong>cadmium</strong>&rsquo;s physicochemical properties (small size, large surface area, and strong electrostatic attraction), and then being transported <strong>only to end up</strong> accumulating in marine organisms. <br /><br />