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A passive dosimeter is to be designed for use in obtaining monthly average concentrations of atrazine in a stretch of river. Typical concentrations range from 10 to 50 g/L. Atrazine, a herbicide commonly found in runoff from agricultural lands. The dosimeter will use activated carbon as the adsorbent. To maximize diffusion rate, the diffusion barrier adjacent to the activated carbon is to be a polycarbonate membrane filter that has pores with a nominal diameter of 1 ?m and a total surface area of pores that is estimated as 0.635 cm^2. The length of the diffusion channels is the thickness of the membrane (10 ?m). Tests have shown that atrazine adsorbs very strongly on activated carbon such that 2 g of activated carbon should be sufficient to ensure that the concentration remains close to zero at the surface of the activated carbon. Given the percent recovery of adsorbed atrazine (using a solvent extraction), the volume of solvent and the sensitivity of the analytical method (a gas chromatographic procedure), the minimum mass of atrazine accumulated by the activated carbon that is capable of detection is 10 ?g.
a). determine whether this dosimeter design will be adequate to detect atrazine given the sampling time and the typical concentration range mentioned above.
b). Discuss the limitations of this monitoring approach.
a quartzite sample in a compression testing mechine is 180mm long and 54mm in diameter. what is the stress under a load of 100kN? if the modulus of elasticity is 102kN/mm2, find the strain develope in the sample.
Hardness is sum of all divalent cations (meaning all species with a positive charge of 2) in a water sample. Magnesium (Mg2+) and calcium (Ca2+) are the most common divalent cations that contribute to hardness.
A Bonda portable generator is powering a small travelling fridge (120V) in your RV and consumes 125 watts. The efficiency of the generator's gas motor is 23% and the electrical portion (power head) is more efficient at 91%.
Determine the net rate of flow of linear momentum through the control surface.
How much calcium bicarbonate (kg/day) will need to be added per day in water with alkalinity of 30 mg/L CaCO3 to prevent rapid pH decrease (assume for simplicity inly bicarbonate alkalinity is present) if 794 kg of Al2(SO4)3 x 18H2O
what are the factors affecting the hydraulic conductivity?
If a watershed of drainage area 100 mi^2 has abstractions of 2.5 in/hr, what runoff volume will show up in the nearby stream in addition to baseflow for a rainfall of 5-hr duration with an intensity of 4 in/hr
A 2014 Ford Mustand convertible in 'Gotta have it Green Metallic' is retailing for $38,000. If you put $3,500 down on the vehicle, and obtain approval for a 2.19% car loan compounded monthly for 5 years.
A separator accepts waste oil at 70% oil and 30% water by weight. The top product stream is pure oil while the bottom underflow contains 10% oil. If a flow of 20 gal/min is fed to the tank, how much oil is recovered
Describe the use of productivity models for estimating land productivity. Provide details about various attributes that can be used and how the model is developed . Examples can be used to demonstrate model workability.
How many 34-inch diameter rivets are required to transmit 55,000 lb from the two angles to the gusset plate if the allowable shear stress in the rivets is 15,000 psi. Assume each rivet carries the same amount of load.
Compute the water table profile drawn in part B. Provide a detailed description of your methodology, and limit your solution to include only 4 image wells. Plot the profile, and provide drawdown amounts at X = -400 m, -200 m, -100 m, 100 m, 200 m,..
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