Shakers, mechanical

Another mechanical shaker is the End-Shak, made by the Newark Wire Cloth Co. Sieves used are Newark test sieves, made to conform with the U.S. standard series. 

Total energy input requirements are primarily a function of the operating pressure drop for the filter. The pressure drop relationship for a reverse-air or a mechanical shaker baghouse is given by the following equation. ... 

As with mechanical shaker and reverse-air baghouses, the operating pressure drop is approximately proportional to their square of the filtering velocity. 

Mechanical shakers A table that vibrates at a given frequency in order to remove particulate matter from a casting. 

Under some circumstances, e.g. the dissolution of a sparingly soluble solid, it may be more advantageous to make use of a mechanical shaker. Various models are available, ranging from wrist action shakers which will accommodate small-to-moderate size flasks, to those equipped with a comparatively powerful electric motor and capable of shaking the contents of large bottles vigorously. 

Pipette 25.0 mL of the potassium ion solution (about 10 mg K + ) into a 50 mL graduated flask, add 0.5 mL 1M nitric acid and mix. Introduce 20.0 mL of the sodium tetraphenylborate solution, dilute to the mark, mix, then pour the mixture into a 150mL flask provided with a ground stopper. Shake the stoppered flask for 5 minutes on a mechanical shaker to coagulate the precipitate, then filter most of the solution through a dry Whatman No. 40 filter paper into a dry beaker. Transfer 25.0 mL of the filtrate into a 250 mL conical flask and add 75 mL of water, 1.0 mL of iron(III) nitrate solution, and 1.0 mL of sodium thiocyanate solution. Titrate with the mercury(II) nitrate solution as described above. 

A 10-g sample of the homogenized dry sample is soaked in 20 mL of distilled water for 2 h. After adding 100 mL of acetone to the soaked sample and shaking vigorously on a mechanical shaker for 30 min, the extract is filtered. After the addition of a further 100 mL of acetone, the sample homogenate is shaken as before and the acetone extract is filtered. The filtrates are combined and acetone is removed with a rotary evaporator. " ... 

Almost all anilides in water samples are directly extracted with ethyl acetate or dichloromethane, and the method of multi-residue analysis can be applied to the water samples. However, in the case of naproanilide, the water sample is extracted with an organic solvent under acidic conditions. A 5-mL volume of 1N hydrochloric acid and 50 mL of ethyl acetate-n-hexane (1 1, v/v) are added to 200 mL of water sample, and the mixed solution is shaken vigorously using a mechanical shaker for... 

To the acidic distillate in the 125-mL separatory funnel, add 5 mL of 50% sodium hydroxide and 15 mL of dichloromethane. Cap the separatory funnel tightly, and allow its contents to cool for 30 min. Heat created by the addition of caustic to the acidic distillate will cause some of the dichloromethane to volatilize, creating pressure in the funnel therefore, the cap must be secured tightly to the funnel. Escaping solvent will result in loss of analytes. Shake the funnel for 5 min on a mechanical shaker. Allow 15 min for phase separation after shaking the funnel. Drain the lower dichloromethane layer into a second 125-mL separatory funnel. Extract the aqueous layer a second time with 15 mL of dichloromethane. Following shaking of the funnel and phase separation, combine both dichloromethane layers in the same 125-mL separatory funnel. 

A 20-g sample of the minced vegetables or fmits is placed in a blender cup, 100 mL of acetone are added and the mixture is shaken vigorously on a mechanical shaker for 30 min. The homogenate is filtered under vacuum through a funnel fitted with a filter paper, and the residue is shaken with 100 mL of acetone and then filtered again. The filtrates are combined and concentrated to about 20 mL using a vacuum rotary evaporator. 

Water (1000 mL) is transferred into a 2-L separatory funnel and extracted with two portions of 50 mL of dichloromethane for 30 min with a mechanical shaker, and the extracts are collected in a 200-mL Erlenmeyer flask. The combined extracts are filtered through anhydrous sodium sulfate into a 300-mL round-bottom flask and evaporated to dryness with a rotary evaporator under vacuum. The residue is dissolved in 1 mL of n-hexane and an aliquot is analyzed by GC/NPD or GC/lTD under the conditions described in Section 2.2.3. Recoveries from water samples fortified with 0.0002 and 0.001 mgL of pendimethalin were in the range 94-110% by GC/NPD and 91-111% by GC/lTD. The detection limit was lower than 0.0001 mgL with both methods. 

The extracts are transferred to a flask which confains 100 mL of 2% Na2 SO4 in 0.1M KOH aqueous solution and 100 mL of n-hexane, and the flask is shaken vigorously for 5 min. The n-hexane layer is separated, a furfher 50 mL of hexane are added to the aqueous layer and the mixed solution is shaken. The combined n-hexane layers are transferred into a separatory funnel containing 100 mL of 0.2 M HCl and shaken vigorously on a mechanical shaker for 5 min. The two layers are separated for the determination of chlornitrofen in the n-hexane layer and CNP-NH2 in the aqueous layer. 

Soil samples are extracted with buffered acetonitrile with a mechanical shaker. Alter centrifuging, aliquots of the extracts are amended with isotopically labeled internal standards and evaporated to dryness. The samples are reconstituted and analyzed by LC/MS/MS. This method determines soil residues of flucarbazone-sodium, sulfonic acid, sulfonamide and NODT with an LOQ of 0.001 mg kg for each analyte. 

Measure 500 mL of water into a separatory funnel and add 150niL of dichloro-methane. Place the sample on a mechanical shaker and shake the funnel for 5 min. Drain the dichloromethane through a filter funnel containing ca 50 g of anhydrous sodium sulfate supported on a plug of glass wool. Re-extract the water sample with an additional 150 mL of dichloromethane for 5 min and filter the dichloromethane through anhydrous sodium sulfate. Combine the dichloromethane fractions and concentrate the extract to dryness in a rotary evaporator with a water-bath maintained below 40 °C. Proceed to Section 6.2.3. 

Rotary vacuum evaporator, 40 °C bath temperature Dry-block bath, electrically heated, temperature 75 °C Mechanical shaker (universal shaker)... 

Mix 10 g of the air-dried soil with 100 mL of acetone and shake the mixture with a mechanical shaker for 30 min. Filter the mixture through a fluted filter paper into a 300-mL round-bottom flask. Wash the residue on the filter with 50 mL of acetone. Combine the filtrates and concentrate by rotary evaporation. 

Laboratory homogenizer and mechanical shaker Nitrogen evaporator pH meter... 

A commonly used extraction technique involves shaking soil with a suitable solvent on a mechanical shaker at about 300 rpm. After extraction, the soil extracts are collected by centrifugation followed by decantation or filtration. This technique could be used for any amount of soil samples (from 10 to >100g). Soil samples greater than 100 g require efficient agitation to achieve acceptable recoveries. 

The residue is removed from the leaf surface by shaking the leaf punch sample in an aqueous surfactant solution. This allows for removal of test substance residue from the leaf surface. It does not remove residue absorbed on the plant matrix that extraction and maceration in organic solvents would release. Generally, the extraction with aqueous surfactant is performed using a mechanical shaker for a 10-min interval and is repeated to increase transfer efficiency. 

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