Abstract：There are many methods to measure the concentration of HPAM. In this paper, the starch-cadmium iodine method was used to measure the concentration of HPAM that existed in the extraction liquid of oil field. The optimum testing condition that measures the concentration of HPAM in the produced water of oilfield is investigated by using the starch-cadmium iodine method , and the testing upper limit and lower limit of this method are affirmed. The features of this method are the wide linear range，simplicity and high accuracy.

In the title coordination polymer, {[Ba(C8H5Cl2O3)2(H2O)].H2O}n, each Ba(II) atom is nine-coordinated by six carboxylate O atoms and one ether O atom from five symmetry-related 2,4-dichlorophenoxyacetate ligands, and by two O atoms from water molecules, thus defining a distorted tricapped trigonal prism. The Ba(II) ions are bridged by bidentate water molecules and by tridentate and tetradentate 2,4-dichlorophenoxyacetate groups, leading to a two-dimensional layer structure. The crystal structure is further stabilized by hydrogen-bonding interactions within each layer.

Abstract:This article studied with emphasis in the caffeine crystallization condition of soaked raises in the crystallization law, separately inspected the ratio of mass of material,the time of soaking,the temperature of soaking,pH effect on the extraction of the caffeine, and the amount of precipitation and other factors on the extraction rate of caffeine to identify the most excellent condition to extract caffeine, in these conditions. Using a melting point and IR identification analysis check the final product which it maybe contain, Have put forward a recovery method precipitated to much phenol of tea polyphenols in experiment course.

Bacterial concentration is detected by the cultivation-microscopy method and the serial dilution method in the different oil field sewage. The results indicate that the results are the same when the bacterial concentration in the clear water, simulated water and waterflooded sewage were detected by the cultivation- microscopy method and the serial dilution method. The order of magnitude are the same and quotient are different when the bacterial concentration in the polymer- flooded sewage were detected by those. The bacterial concentration by the cultivation-microscopy method detected is more than by the serial dilution method detected when the waterflooded sewage and the polymer-flooded sewage were joined the biocide. They are used to detect the bacterial concentration in the different concentration scop of polymers, the results are the same in the concentration scop of polyacrylamide under 100mg/L, while the results are very different in the concentration scop of polyacrylamide above 200mg/L.