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One limitation of SPME methods is the limited adsorption capacity of the fiber due to the short length (~1 cm) and diameter (~100 um) typically exposed to Analytes. Explain for the analysis of drinking water samples for chloroform, the SPME fiber is normally immersed into a 3.0mL volume of water for 30 minutes as well as then injected directly into a GC. Detection utilizing an electron capture detector provides an absolute limit of detection of 0.5 pg for chloroform. The maximum mass of chloroform that can be adsorbed by the fiber after a 30 minute exposure is 350 ng. The extraction efficiency for chloroform utilizing the SPME method is 85% throughout the entire concentration range that can be determined. The million dollar question- Explain what concentration range (in ug/L) can be determined using this technique?
Calculate the cell potential for the following reaction as written at 61 °C, given that [Mg2 ] = 0.854 M and [Ni2 ] = 0.0100 M. If Mg(s)+Ni^2+ Mg^2+ + Ni(s). E^o for Mg half-cell is -2.38 and for Ni -0.26
Chlorine released from chlorofluorocarbons (CFCs) reacts with ozone in the atmosphere to form oxygen. The proposed reactions are
Calculate the heat lost by the hot water, Calculate the heat gained by the cold water, Calculate the calorimeter constant, using the delta T of the cold water.
In the following conditions calculate the moles of hydrogen and the pressure in each flask where the volume is negligible. Each flask is originally 275K with .455 mols of hydrogen gas and .7atm of pressure. Then one flask is heated to 500K while t..
How do you rank crystal lattice structures in order of decreasing efficiency of space in the structure
What is the mass of air in the cylinder? What is the temperature in the cylinder when the volume reaches 4.00 in3?
Calculate the Standard Enthalpies & Standard Entropies for each reactant & product at the temperature given first, then determine the ?H°rxn and ?S°rxn at 1600 K Zr(beta) + O2 = ZrO2(beta) Other information:
cobalt-60 has a halflife of 5.26 yr. the cobalt-60 in a radio therapy unit must be replaced when its radioactivity
Calculate the work in kilojoules done during a synthesis of ammonia in which the volume contracts from 8.8L to 4.3L at a constant external pressure of 46 atm
water to give a solution that has a vapor pressure of 37.2 torr at 35 °C? Assume complete dissociation of the solute and ideal solution behavior
A cell based on the reaction below has a standard potential of +0.42 V at 25°C. If all of the species are at standard conditions except [H+], at what pH will the cell have a potential of zero. H2O2(aq)+ 2 H+(aq) + 2 Cl-(aq)? Cl2(aq) + 2H2O(l)
an electric power station annually burns 3.3 107 kg of coal containing 1.4 percent sulfur by mass. calculate the volume
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