Font Size: a A A

Water Quality-Pilot Study On Improvement Of Determination Of Oil In Sediment By Infrared Photometric Method

Posted on:2011-08-23Degree:MasterType:Thesis
Country:ChinaCandidate:W P LiuFull Text:PDF
GTID:2121360308963152Subject:Environmental Engineering
Abstract/Summary:PDF Full Text Request
Water pollution from oil substances is another focus of global concern. As early as the end of the last century, there isn't uniform oil substances detecting method, which worried scientific researchers as well as monitoring workers. The early quantitative methods are to measure the unique absorption (emission) of the certain group among the components of some chemical compounds of a mixed group, and then calculate the total mixture composition. Once the relative content of the compound with the characteristics of the group, changes, the absorption coefficient will surely change. Hence the problem of choice of standard oil has to be faced. Now the application of three-wavelength infrared spectrophotometer meter oil testing technique not only solve the problem of the unification of monitoring methods but also realize being qualitative first and then being quantitative. The three-wavelength infrared spectrophotometer meter oil testing technique cleverly utilize the quantitative multi-weighted sum of group theory to avoid the issue of screening and determining special standard oil so as to settle the difficult point of current various oil substances detecting methods. This technique defines the uniform solvent and extraction conditions used thus averts the error caused by the vary of solvent extraction efficiency. It consider the CH2 group in the C-H bond stretching vibration (wave number of 2960cm-1), CH3 groups in the C-H bond stretching vibration (wave number 2960cm-1) and also consider aromatic ring C-H bond stretching vibration (wave number to 3030cm-1).In this task the author determines the oil in water with three-wavelength infrared photometric method and makes a study on improvement of methods aiming at GB/T16488-1996 mainly. The improvement of methods runs through the entire process of collection, transportation, conservation and determination of water samples. It includes research and improvement on preparation before sample collection, optimization of volume of sample collection, collection and reservation of samples, testing performance of instruments, improvement of extraction methods, solving emulsification of carbon tetrachloride after extraction, interfering substances affecting determination, replacement of carbon tetrachloride, simplifying experiment operation and so on. Secondly the recycle of the waste carbon tetrachloride liquid produced after experiment is also studied. Therefore a feasible and convenient method that can save time, labor and cost and can draw relatively stable conclusion is obtained and an operation manual fit for this technique is finally summed up.
Keywords/Search Tags:infrared, determination of oil in water, improvement of determination, recycle
PDF Full Text Request
Related items