Filter the separated aqueous layer, wash the diphenyl ether with 5.0ml of ice-cold water, pass the washings through the filter, and collect the filtrate and washings in a 25-ml volumetric flask.

過濾已分離的水層自拍偷拍12，用5.ml的冰水洗滌二苯醚，合并濾液和洗滌液亚洲中文字幕,中文字幕在线。

Decant the solution into a 200 ml volumetric flask, repeatedly rinsing the flask with n-hexane.

然后將溶液緩緩倒入一200 ml的容量瓶中4438黄色网，再用正己烷將上述步驟重復(fù)一遍。

Result］ It could be concluded through analyzing the model that both the mass uncertainties of quinoline phosphomolybdate precipitates and tested samples were from the resolving power and precision of balance and its maximum tolerance in assay certificate; the uncertainty brought in by volumetric flask was from the permissible error of 250 ml volumetric flask, the operation of increasing the volume to scale of volumetric flask while diluting solution and the difference between experimental temperature and the temperature at the time when the volumetric flask was calibrated; the uncertainty brought in by pipette was from the permissible error of itself, the operation of increasing the volume to intake scale while taking solution and the difference between experimental temperature and the temperature at the time when the pipette was calibrated.

結(jié)果］磷鉬酸喹啉沉淀和試樣質(zhì)量的不確定度均來自天平的分辨力网站黄色视频a、精確度人妻专区、鑒定證書上天平的最大允差，容量瓶引入的不確定度來自250 ml容量瓶本身的允許誤差国产性爱aaa、稀釋溶液時將體積增加到容量瓶刻度的操作和試驗溫度與容量瓶校準時溫度的差異伊人国产精品，吸量管引入的不確定度來自于吸量管本身的允許誤差、吸取溶液時將體積增加到吸取刻度時的操作和試驗溫度與吸量管校準時溫度的差異日本黄色视频久久久。

Pipette 5 cm3 of 40% formaldehyde into a 1000 cm3 volumetric flask.

將5 cm3的40%甲醛移液到一個1000 cm3容量瓶里亚洲日韩精品无码专区网站。

ResultThe maximumabsorption wavelength of reaction solution was about 720nm.The fermentation volume,adding the activated carbonor not,pHvalue of reaction solution and so on had no great effect onthe determinationresults and they could increase the screening efficiency.The effect of ultrasonic treatment for20min was obvious.When50ml volumetric flask was used,the suitable sampling volume was 2.5ml.It was better to centrifugate the fermentationliquid and the supernatant could be taken after standing inthe determination when necessary.

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Stock Solution— Dissolve 34 g of monobasic potassium phosphate in about 500 mL of water contained in a 1000-mL volumetric flask.

貯備液：將34g磷酸二氫鉀在1000mL容量瓶中溶解于約500mL水中。

1 Place about 9.8 mL of methanol into a 10 mL ground-glass stoppered volumetric flask.

在10mL玻璃塞容量瓶中加入9.8mL甲醇免费先看一级A片在线不卡。

Cool the solution, cautiously dilute with water, transfer to a 200-mL volumetric flask, dilute with water to volume, mix, and filter.

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In volumetric analysis, we use many glass vessels such as mortar, test tube, beaker, separate funnel, grade cylinder, pipette, Erlenmeyer, buretteand volumetric flask to ground, dissolve, separate, pipe, titrate samples or dilute samples to volume.

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In volumetric analysis, we use many glass vessels such as mortar, test tube, beaker, separate funnel, grade cylinder, pipette, Erlenmeyer, buretteand volumetric flask to ground, dissolve, separate, pipe, titrate samples or dilute samples to volume.

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