Response_to_Reviewer-第二次.doc

., Ph.D. ProfessorLaboratory of Plant Nutrition and Ecological Environment Research,Huazhong Agricultural University, Wuhan, 430070, P.R.China E-mail: Aug. 1st, 2009RE: HAZMAT-D-09-00655R1Dear Editor，We thank the reviewers and editor for the time in closely viewing our manuscript. We would like to thank the reviewers for giving us constructive suggestions which would help us both in English and in depth to improve the quality of the paper. Here we submit a new version, which has been modified according to the reviewers suggestions. Efforts were also made to correct the mistakes and improve the English of the manuscript. We mark all the changes in red in the revised manuscript.Sincerely yours, Ph.D. Professor-The following is a point-to-point response to the two reviewers comments. Reviewer #1: Generalcomments:Reviewer #1: Page 3, lines 49-50:Is it true that the thickness of application agriculture films in some regions in China is less than 0.005 mm? -The thickness of the commercial PE mulching films available in the market is usually larger than 20 microns. Answer: Thank the reviewer and editors for the comments. It is ture that the thickness of application agriculture films in some regions in China is less than 5 microns. This data has been published in many journals in China.Page 6, lines122-125.above weight loss data indicate that the photocatalytic reaction of PE-goethite composite films has occurred and produced a mass of volatile products, which were supposed to be carbon dioxide, methane, ethene, ethane, propane, acetaldehyde, formaldehyde and acetone 14. - Which is the justification of using the term were supposed to be.? Is this what really happens or perhaps there could be some additional processes and degradation products that are not known at the present? Answer: Thank the reviewer and editors for the comments. Weve recognized that this description in the previous copy were not accurate. The sentence “.above weight loss data indicate that the photocatalytic reaction of PE-goethite composite films has occurred and produced a mass of volatile products, which were supposed to be carbon dioxide, methane, ethene, ethane, propane, acetaldehyde, formaldehyde and acetone 14.” was changed to “.above weight loss data indicate that the photocatalytic reaction of PE-goethite composite films has occurred and might produce a mass of volatile products. This result was similar to that described in the works 14. The volatile products may be carbon dioxide, methane, ethene, ethane, propane, acetaldehyde, formaldehyde and acetone.” (Page 6 line 125-129). We will determine the volatile products in the future work.Reviewer #3: 1. Photocatalysis is normally done in presence of air and water. Please show air and water inlet in the experimental set up. At the same time, please label the experimental set up. Please also indicate sample size. Answer: The reviewer and editors suggestions have been adopted. The air and water inlet and experimental set up have been labled in Fig. 1 and the sample size also has been indicated in Fig. 1.2. FTIR for such solid samples are generally done in ATR mode. Please indicate.Answer: Reviewer and editors suggestions have been adopted. The ATR mode has been indicate in Page 6 line 113-115.3. Lines 124-127: Data fittings were required to calculate the value of first order rate constants (in time-1 unit) at various loading of the photocatalyst. Table 1 is confusing.Answer: Thank the reviewer and editors for the comments. We apologize for the error in Table 1 in original paper. The rate equation from the time-weight data has been re-calculated given in Table 1 in the present paper.4. Ref 12: Name of the fourth author should be P. Das, not P. Dasb.Answer: Reviewer and editors suggestions have been adopted and We changed the P. Dasb to P. Das as recommended (Page 11 line 233).5. Please check and revise t