Fig. 6 (a) shows the effect of hydrogen peroxide increase on the MB removal at constant pH 3 and Fe3+ of 40 mg/L. The results show that the degradation rate of MB increases with an increase in initial H2O2 concentration from 100 to 400 mg/L, but in excess of about 400 mg/L; the H2O2 dose of 1000 mg/L, plot of the reaction rate curve is almost horizontal. This could be illustrated that the presence of H2O2 beyond the ratio with Fe3+ does not improve the MB degradation. According to Murry and Parson (2004) hydrogen
Record results to determine if NaHCO3 increases or decreases the pH of the water. 10. If NaHCO3 increases the pH of the water, it shows that it will increase the pH of the blood and if NaHCO3 decreases the pH of the water, it shows that it will decrease the pH of the blood. 11. Add 30ml of 0.1M HCl into a beaker containing distilled water.
The line of best fit gives the respiration rate of day-old seedlings as the concentration of NaCl they are exposed to increases. As NaCl Concentration increases the rate of cellular respiration decreases by .108 ppm CO2/g per second. This overall decrease throughout the data further supports our hypothesis. Discusion: The data collected in the experiment does support our hypothesis. By examining the data as a whole a trend of decreased cellular respiration in seedlings soaked in solutions with increased NaCl concentrations.
7. In this experiment, if the sucrose concentration were increased to 70 g/l would you expect sucrase activity to be significantly higher than the activity at 35 g/l. Explain your answer. No, because based on the results once it reached 30 g/l 35 g/l the results had stayed the same. There, the activity is lessening and coming to what looks like a plateau.
They are also formed as necessary intermediates of metal catalysed oxidation reactions. Figure 1 shows examples of common ROS and shows the number of orbiting electron. Atomic oxygen has two unpaired electrons in separate oribits in its outer electron shell making it susceptible to radical formation, and ROS form when oxygen is reduced by the addition of electrons4. ROS are produced naturally from many metabolic processes, but alcohol consumption can also induce oxidative stress3, due to changes in NAD+/NADH ratio due to alcohol metabolism. Oxidative stress can also be caused by excess exposure to UV light, leading to apoptotic or necrotic cell death, which can lead to skin ageing and be responsible for skin cancer and other cutaneous inflammatory disorders5.
(Where removal of organics by activated carbon takes minutes, removal of chlorine literally takes seconds). The chlorine capacity of new activated carbon is 1 pound of chlorine per pound of carbon at a flow rate of 3 to 5 gpm/cu.ft. and a bed depth of 3 feet. Chloramine removal by activated carbon is a much slower reaction. The predominant species of chloramine in city water supplies (pH about 7 to 8) is monochloramine.
paracasei isolated from the Portuguese dairy industry was found to be 2.5 mg/ml with surface tension 41.8 mN/m (Gudina et al., 2010). Those surfactants can decrease the surface tension of water or PBS around 36-39 mN/m and even their cmc values ranges from 1.0-20 mg/mL. As compare to the chemical surfactant surface tension reduction and cmc values it has been very close to the surface tension reduce by the SDS (Sodium dodecyl sulfate) i.e. 37.0 mN/m and 1.8 mg/L respectively. Biosurfactant produced by the Lactobacillus spp.
Question 2 The cost of service is changed as the density/cubit foot increased, because carriers are able to carry greater weight within in same space. Plus, the tubular containers reduce the possibility of damages to the products. The risk is lower. Questions 3 As has mentioned in question 2, the tubular containers reduce the damages to the products, the value of customer service are changed. Weight Selling Price (8-5)/8=37.5% Old bag 8 ounces $0.59 New bag 5 ounces $0.59 Comparing the 2 packaging style, for same price, the product has decreased for 37.5%.
We are also able to better control and determine the volume of NaOH in the burette needed to neutralise HCI, CH3COOH and the unknown acid. This is because the amount of NaOH droplet can be altered when a burette is used thus, the NaOH solution can be dripped per drop at the time nearing the end point of the experiment as the colour changes rather quickly from light pink to pink. Conclusion: In conclusion, titration is an effective technique to determine the equivalence point, pH range, pKa, Ka and molecular mass of the unknown acid of the acid-base reaction. This technique is dependent on the colour change of the indicator which makes it easier to determine the end point of the experiment. Postlab Exercises: 1.
That means that there was a small lag phase. As the initial crude oil concentration increased to 20 and 40 ml/L the lag phase raised. In fact, it was found that the lag phase was increased when the initial crude oil concentration was higher due to the slower cell adaptation. This shows that the toxicity of crude oil inhibited MS1 strain at high concentrations (19, 33). Varius types of kinetic substrate consumption and inhibition models have been used to explain the dynamics of microbial growth on different compounds for example Phenol, Toluene, Benzene and p-cresol (16, 32, 34).
As seen in the trend of both buffer, once the pH is lower than 3, the slope of dv/dpH increase drastically, showing the decreasing effects of the buffer. On the other hand, in the trend of both buffer on the right side of graph shows when NaOH is added, the change in pH is more drastic once past about pH 5. Although buffer 1 and buffer 2 shows a similar trend, the plot of buffer 1 is above the plot of buffer 2. The reason for this is that buffer 1 is made by an acid and base with an almost equal concentration. This makes buffer 1 a greater buffer compared to buffer 2.