1、精品文檔在25Mpa壓力下，液體中的溶解氧是多少?就是水，里面加了 些殺菌劑和防腐劑，不過時間長了，可能已經被氧化掉了你可以按照水的溶解度計算氧在水中的溶解度和溶解氧值是兩個既相區別而又相聯系的概念。氧在水中的溶解度指的是水體和大氣處于平衡時氧的最大溶解濃度，它的數值與溫度、壓力、水中溶質 量等因素有關。水中溶解氧值則股是指非平衡狀態下的水中溶解氧的濃度。它的數值與水 體曝氣作用、光合作用、呼吸作用及水中有機污染物的氧化作用等因素有關。這兩個概念之 間的差異是由于大氣和水體界面間氧氣傳質動力過程較慢而引起的。氧在水中的溶解度若已知當25c下水蒸氣在空氣中含量為0.0313摩爾分數以及干空氣中含

2、20.95%。2時，則可應 用道爾頓分壓定律和亨利定律算出標準條件下氧在水中溶解度O2(aq)：O2(aq) =Ko2 po2=1.28x10-8x (1.0000-0.0313) 0x1.013x105x0.2095=2.63x10-4mol/L (相當于8.4mg/L)由(4-2)式可導出在定壓條件下溫度對氧氣在水中溶解度影響的關系式： 5 AH 11 "匕 5 2.303R Tl T2 .式中C1和C2分別為絕對溫度T1和T2下氣體在水中溶解度(mg/L)： H溶解熱(J/mol)：R氣體常數(8.314J/Kmol)0壓力對氧氣在水中溶解度的影響可用下列公式表述：C 1,01

3、3X05-p式中C1和C2分別為標準氣壓和P2氣壓下氧氣在水中的溶解度(mg/L)：P確定溫度下飽和水蒸氣的壓力(P和P2的單位為帕)。P:25水飽和蒸汽壓為3.169xlO3PaCl： =2.63x10-4mol/L (相當于8.4mg/L) N2 : 8.93xia4mol/LC2：現在增壓罐壓力0.8MPa,即S.OxlCPa,計算得：C2=2L356x104moL/L=0.l367g/L=0.0478L/L,約 100L 水溶解 4.78L 氧氣計算得:C272.5M Q 4moUL0.203f:/L=0.1624UL,約 100L 水溶解 1624L 氮氣飽和蒸氣壓飽和蒸和壓(sat

4、urated vapor pressure) 在密閉條件中，在定溫度下,與液體 或固位處于相坨的蒸氣所具有的壓2l稱為飽和蒸氣壓。同物畫在不同溫度下有不同的蒸 氣壓，并隨著溫度的升高而增大。不同液體飽和蒸汽壓不同，溶質的飽和蒸汽壓大于溶液的 飽和蒸汽壓；對于同物質，固態的飽和蒸汽壓大于液態的飽和蒸汽壓。例如，在30C時， 水的飽和蒸氣壓為4132.982Pa,4醛為10532.438Pa。而在100C時，水的飽和蒸氣壓增大到 101324.72Pa,乙醇為222647.74Pa0飽和蒸氣壓是液體的項重要物理性質,如液體的沸點、 液體混僉物的相對揮發度等都與之有關。飽和蒸氣壓面級水在不同溫度下的

5、飽和蒸氣壓 Saturated Water Vapor Pressures at Different Temperatures飽和蒸氣壓飽和蒸氣壓飽和蒸氣壓溫度溫度溫度(Saturated(Saturated(Saturated(Temperature(Temperature(Temperaturewater vaporwater vaporwater vapor)pressure)pressure)pressure)t/vtrctiv/(x10A3Pa)/(x10A3Pa)/(x10A3Pa)00.61129125232.012503973.610.65716126239.242514041

6、.220.70605127246.662524109.630.75813128254.252534178.940.81359129262.042544249.150.87260130270.022554320.260.93537131278.202564392.271.0021132286.572574465.181.0730133295.152584539.091.1482134303.932594613.7101.2281135312.932604689.4111.3129136322.142614766.1121.4027137331.572624843.7131.4979138341.

7、222634922.3141.5988139351.092645001.8151.7056140361.192655082.3161.8185141371.532665163.8171.9380142382.112675246.3182.0644143392.922685329.8192.1978144403.982695414.3202.3388145415.292705499.9212.4877146426.852715586.4222.6447147438.672725674.0232.8104148450.752735762.7242.9850149463.102745852.4253

8、.1690150475.722755943.1263.3629151488.612766035.0273.5670152501.782776127.9283.7818153515.232786221.9294.0078154528.962796317.2304.2455155542.992806413.2314.4953156557.322816510.5324.7578157571.942826608.9335.0335158586.872836708.5345.3229159602.112846809.2355.6267160617.662856911.1365.9453161633.53

9、2867014.1376.2795162649.732877118.3386.6298163666.252887223.7396.9969164683.102897330.2407.3814165700.292907438.0417.7840166717.832917547.0428.2054167735.702927657.2438.6463168753.942937768.6449.1075169772.522947881.3459.5898170791.472957995.24610.094171810.782968110.34710.620172830.472978226.84811.

10、171173850.532988344.54911.745174870.982998463.55012.344175891.803008583.85112.970176913.033018705.45213.623177934.643028828.35314.303178956.663038952.65415.012179979.093049078.25515.7521801001.93059205.15616.5221811025.23069333.45717.3241821048.93079463.15818.1591831073.03089594.25919.0281841097.530

11、99726.76019.9321851122.53109860.56120.8731861147.93119995.86221.8511871173.8312101336322.8681881200.1313102716423.9251891226.1314104106525.0221901254.2315105516626.1631911281.9316106946727.3471921310.1317108386828.5761931338.8318109846929.8521941368.0319111317031.1761951397.6320112797132.5491961427.

12、8321114297233.9721971458.5322115817335.4481981489.7323117347436.9781991521.4324118897538.5632001553.6325120467640.2052011568.4326122047741.9052021619.7327123647843.6652031653.6328125257945.4872041688.0329126888047.3732051722.9330128528149.3242061758.4331130198251.3422071794.5332131878353.4282081831.

13、1333133578455.5852091868.4334135288557.8152101906.2335137018660.1192111944.6336138768762.4992121983.6337140538864.9582132023.2338142328967.4962142063.4339144129070.1172152104.2340145949172.8232162145.7341147789275.6142172187.8342149649378.4942182230.5343151529481.4652192273.8344153429584.5292202317.

14、8345155339687.6882212362.5346157279790.9452222407.8347159229894.3012232453.8348161209997.7592242500.534916320100101.322252547.935016521101104.992262595.935116825102108.772272644.635216932103112.662282694.135317138104116.672292744.235417348105120.792302795.135517561106125.032312846.735617775107129.392322899.035717992108133.882332952.135818211109138.502343005.935918432110143.242353060.436018655111148.122363115.736118881112153.132373171.836219110113158.292383288.636319340114163.582393286.336419574115169.022403344.7365