surface chemical analysis of raw cotton fibres and associated materials

... know- ledge of the identities and quantities of pollutants and other chemical species in water, air, soil, and biological systems. Therefore, proven, state -of- the-art techniques of chemical analysis, ... LLC 24 CHEMICAL ANALYSIS OF WATER AND WASTEWATER __________________________ __________________________ 24.1. GENERAL ASPECTS OF ENVIRONMENTAL CHEMICAL ANALYSIS Scientists’ understanding of the ... in the evolution of analytical chemistry, characterized by the development of new and improved analysis techniques that enable detection of much lower levels of chemical species and a vastly increased...

Ngày tải lên: 23/07/2013, 20:57

... Annual Book of Standards, Part 31, D3694-78. “Standard Practices for Preparation of Sample Containers and for Preservation of Organic Constituents,” American Society for Testing and Materials, ... control program. The minimum requirements of this program consist of an initial demonstration of laboratory capability and an ongoing analysis of spiked samples to evaluate and document data quality. The ... Parts 136.4 and 136.5. 1.7 This method is restricted to use by or under the supervision of analysts experienced in the use of HPLC and GC systems and in the interpretation of liquid and gas chromatograms....

Ngày tải lên: 14/02/2014, 03:20

... the secondary dilution standard be prepared at a concentration of 15 àg/mL of each internal standard compound. The addition of 10 àL of this standard to 5.0 mL of sample or calibration standard would be ... control program. The minimum requirements of this program consist of an initial demonstration of laboratory capability and an ongoing analysis of spiked samples to evaluate and document data quality. The ... tap and distilled water and dry at 105°C for one hour before use. 5.2 Purge and trap system—The purge and trap system consists of three separate pieces of equipment: a purging device, trap, and...

Ngày tải lên: 14/02/2014, 03:20

... 15-40% of Mass 95. 75 30-60% of Mass 95. 95 Base Peak, 100% Relative Abundance. 96 5-9% of Mass 95. 173 <2% of Mass 174. 174 >50% of Mass 95. 175 5-9% of Mass 174. 176 >95% but 101% of Mass ... of each internal standard compound. The addition of 10 àL of this standard to 5.0 mL of sample or calibration standard would be equivalent to 30 àg/L. 7.3.3 Analyze each calibration standard according ... control program. The minimum requirements of this program consist of an initial demonstration of laboratory capability and an ongoing analysis of spiked samples to evaluate and document data quality. The...

Ngày tải lên: 05/03/2014, 21:20

... Annual Book of Standards, Part 31, D3694-78. “Standard Practices for Preparation of Sample Containers and for Preservation of Organic Constituents,” American Society for Testing and Materials, ... control program. The minimum requirements of this program consist of an initial demonstration of laboratory capability and an ongoing analysis of spiked samples to evaluate and document data quality. The ... stock standards to a volumetric flask. To each calibration standard, add a known constant amount of one or more internal standards, and dilute to volume with 2-propanol. One of the standards...

Ngày tải lên: 05/03/2014, 21:20

... Annual Book of Standards, Part 31, D3694-78. “Standard Practices for Preparation of Sample Containers and for Preservation of Organic Constituents,” American Society for Testing and Materials, Philadelphia. 4. ... identifications should be based upon measurements of actual retention time variations of standards over the course of a day. Three times the standard deviation of a retention time for a compound can be ... containing a concentration of C, in àg/L. APPENDIX A TO PART 136 METHODS FOR ORGANIC CHEMICAL ANALYSIS OF MUNICIPAL AND INDUSTRIAL WASTEWATER METHOD 605—BENZIDINES 1. Scope and Application 1.1 This...

Ngày tải lên: 14/03/2014, 20:20

... control program. The minimum requirements of this program consist of an initial demonstration of laboratory capability and an ongoing analysis of spiked samples to evaluate and document data quality. The ... more stock standards to a volumetric flask. To each calibration standard, add a known constant amount of one or more internal standards, and dilute to volume with hexane. One of the standards should ... Annual Book of Standards, Part 31, D3694-78. “Standard Practices for Preparation of Sample Containers and for Preservation of Organic Constitutents,” American Society for Testing and Materials, Philadelphia. 4....

Ngày tải lên: 14/03/2014, 20:20

... handling of these materials. Nitrosamine reference standards and standard solutions should be handled and prepared in a ventilated glove box within a properly ventilated room. 5. Apparatus and ... method. When results of sample spikes References 1. Fine, D.H., Lieb, D., and Rufeh, R. “Principle of Operation of the Thermal Energy Analyzer for the Trace Analysis of Volatile and Non-Volatile ... Annual Book of Standards, Part 31, D3694-78. “Standard Practices for Preparation of Sample Containers and for Preservation of Organic Constituents,” American Society for Testing and Materials, Philadelphia. 6....

Ngày tải lên: 22/03/2014, 14:20

... FOR ORGANIC CHEMICAL ANALYSIS OF MUNICIPAL AND INDUSTRIAL WASTEWATER METHOD 625—BASE/NEUTRALS AND ACIDS 1. Scope and Application 1.1 This method covers the determination of a number of organic ... volume of 1 L. When sample volumes of 2 L are to be extracted, use 250 mL, 100 mL, and 100 mL volumes of methylene chloride for the serial extraction of the base/neutrals and 200 mL, 100 mL, and 100 ... continuous extractor and using a pipet, add 1.00 mL of surrogate standard spiking solution and mix well. Add 60 mL of methylene chloride to the sample bottle, seal, and shake for 30 seconds to rinse the inner surface. ...

Ngày tải lên: 28/03/2014, 19:20

Ngày tải lên: 28/03/2014, 20:20

Ngày tải lên: 10/07/2014, 23:20

Ngày tải lên: 10/07/2014, 23:20

Ngày tải lên: 11/08/2014, 11:20

... A cut-off value of –10.34% resulted in a sensitivity of 54 % and specificity of 59 % (see Table 6). The intra- and inter-observer variation of our data is congruent with the data of Jarnert ... comparison to adjacent and non-infarcted segments with a sensitivity of 80% and a specificity of 70% (AUC 0.8) with a cut-off value of less than 1.95 cm/s. Poor agreement between VVI and TDI meas- urements ... By using the previously proposed cut-off value 15 for strain of –6.5 % a sensitivity of 23 % and specificity of 87 % was calculated for the detection of infarcted segments (AUC 0.6, confidence...

Ngày tải lên: 25/10/2012, 11:15

... Journal of Water and Environment Technology, Vol.2, No.2, 2004 - 68 - - 68 - EXPERIMENTAL MATERIALS AND METHODS Biofilm Samples Two types of biofilms, a domestic wastewater biofilm and ... microprofiles of O 2 , NH 4 + , NO 2 - , and NO 3 - in the autotrophic nitrifying biofilm (B). The distribution and magnitude of the estimated specific rates of net consumption and production of ... and Y. Watanabe. 2001. Analysis of microbial structure and function of nitrifying biofilms. Meth. Enzymol. 337: 213-224. 26. Okabe, S., T. Ito, H. Satoh, and Y. Watanabe. 1999b. Analyses of...

Ngày tải lên: 05/09/2013, 08:40

... temperature. 4. Parametric analysis and results Sizing GSHP system by GLD and GLHEPRO software for the given building loads and operation range of the first loop of the heat pump, the boreholes’ ... 17178/2010, Official Gazette 1387/B/9-2-2010. [15] Technical Chamber of Greece. Thermophysical properties of construction materials and control of thermal insulation efficiency of buildings. ... current study as part of parametric analysis. Sizing software calculates borehole length considering the heating and cooling demands. In the current study the values of these demands are very close...

Ngày tải lên: 05/09/2013, 16:10

... Evaluation of rules defining collective and individual behavior of actors and their interactions is a part of this exercise. Human security of local communities and social rehabilitation of affected ... Protection of Population and Territories from Natural and Technological Emergencies On Emergencies and Rescue Service and on Status of Rescue Forces On Sanitary and Epidemiological Safety of Population ... resources”(ISDR 2004). In many parts of Asia a declaration of state of emergency signifies a state’s recognition of a disastrous event and often is based on loss of property and investments. IFA indicates...

Ngày tải lên: 22/10/2013, 10:15

Ngày tải lên: 26/11/2013, 13:29

Ngày tải lên: 12/12/2013, 00:03

Ngày tải lên: 14/12/2013, 00:40