Arsenic is the highly poisonous inorganic contaminants originating from either earth crust or anthropogenic activities. Arsenic caused both are severe and chronic health effects on the human body, such as respiratory, pulmonary, cardiovascular, gastrointestinal, dermal changes (pigmentation, hyperkeratoses, and ulceration), immunologic, hematological, genotoxic, mutagenetic, hepatic, renal and carcinogenic effect (kazoo T Suzuki et al 2002). According to the United States Environmental Protection Agency (US EPA) maximum arsenic contaminant level (MCL) is now decrease 50 to 10 micrograms per liter.[US EPA. Minor clarification of National Primary Drinking Water Regulation for arsenic] .Due to adverse health effect of arsenic, in the last few …show more content…
0.1, 0.5 and 1 gm NZVI/AC was taken into diff conical flask. Each conical flask containing 500 ml of 2 mg/l As solution. Initial pH of this solution was adjusted at 6.5 with the help of buffer .1 Mol/l HCL or NaOH. For the isotherm study use Boyd model. At ph 6.5 nearly 94.3% as(iii) and 65.3% as(v) was removed in first 12 hours of removal process but there adsorption equilibrium was achieved in 72 hours which gave approx. 100 % removal of as. This study also shows that if dose of NZVI/AC applied increases from 0.1 to 3 g/l then as removal of arsenate and arsenate increase from 68 and 57 % to 100 %. As removal by nzvi/ac is fallen from pH 3 to pH 12 whereas the removal of as from arsenate solution increases from pH3 to 6.5 and decreases rapidly below pH 9. The two line meet at pH 4.5. above this pH value as removal eff was much more for arsenate. It indicates nzvi/ac is superior for removal of as(iii) at diff pH of ground water. Adsorption of arsenate on nzvi/ac decreases from neutral to alkaline media while for arsenate it increases in acidic media and decreases in alkali media. In this case pH of zero point charge obtained at pH 7.4 . at pH <9, arsenate species are H3AsO3 is predominant and in pH range 9-12 H2AsO3- is predominantly available in drinking water. If iron used in activated carbon by 4.22% then iron filled AC increases removal of arsenic but if % of iron in AC …show more content…
A 100ml solution containing 0.16gm FeCl3,0.1 gm PEG and 0.1 gm Fecl2.4H2O is mixed at 65 C and pH of this solution was slowly increased upto 10 by adding 25 % of NH3. After one hour of at 70 C suspension was washed. Finally this modified activated carbon fibre cloth (MACF) is dried in an oven at 102 C for two hours. The adsorbent dosage was applied in the range of 0.6 to 0.7 gm per litre. This adsorbent were added into 50ml of arsenate solution with an as(v) concentration of 2mg for evaluation of adsorption efficiency after shaking of solution at room temp. for 24 hr sample solution filtered through a .45 micro meter for adsorption isotherm experiments conducted t pH 4 and pH effect experiment are done ranging from 1.8 to 11.6 at a constant concentration 2mg/l. Batch process is conducted to obtained the pH of point of zero charge (pHpzc) of the RACF and the MACF. Different amount of NaNO3 solutions of 1mili M with several pH values and prepared with mixing diluted HNO3 or NaOH . ACF cloths has 0.05 g weight was added into 18 mL NaNO3 solutions. After mixing it properly in PVC vials for 24
A hot plate was placed under the ring stand. 50 mL of 3.0 M NaOH in a 250 mL beaker and a stir bar was placed in the beaker. The beaker with NaOH was placed on the hot plate and 3.75 grams of NaAlO2*5H2O was placed in the beaker. The temperature probe was placed in the beaker with the solution, not touching the bottom of the beaker. The solution was heated and stirred till the solution dissolved.
Next, about 10 mL of both solutions, Red 40 and Blue 1, were added to a small beaker. The concentration of the stock solution were recorded, 52.1 ppm for Red 40 and 16.6 ppm for Blue 1. Then, using the volumetric pipette, 5 mL of each solution was transferred into a 10 mL volumetric flask, labelled either R1 or B1. Deionized water was added into the flask using a pipette until the solution level reached a line which indicated 10 mL. A cap for the flask was inserted and the flask was invented a few times to completely mix the solution. Then, the volumetric pipette was rinsed with fresh deionized water and
According to the article “How Tap Water Became Toxic in Flint, Michigan,” written by Sara Ganim and Linh Tran, the residents of Flint, Michigan highly disapproved of the new water source. Around 2 years ago, the city of Flint was forced to switch their water supply from Lake Huron to a more local source, Flint River. Before, this was not a big problem to the residents of Flint because they were told that the water they were drinking was harmless. However, people began to doubt that the water they were drinking was safe because it looked like sewage. Over time, new evidence began to arise claiming that the water contained massive amounts of lead and iron.
The quantitative solubility of the unknown compound was determined to be 29/100ml. The known solubility of sodium sulfate is 28.11g/100mL water. Using the found solubility to compare to the known solubility of sodium sulfate. This solution created in the solubility test, the conductivity of the unknown compound was tested using an Ohmmeter to measure the resistance of the solution. Resistance is the measure of a substances ability to conduct
Lastly, the unknown compound was reacted with two different salts. For the first salt, 0.50 grams of KCl was mixed with 5 mL of water in one beaker while 0.5 grams of NaNO3 was mixed with 5 mL of water in a different beaker. Then, the NaNO3 solution was added to the KCl solution. To perform the reaction with the second salt, 0.50 grams of KCl was mixed with 5 mL of water and 1 mL of 1 M Ag(NO3)2 was added. After performing each reaction, the solution was observed to see if a reaction occurred and the pH value of the resulting solution was tested using a pH
The objective of the Unknown White Compound experiment was to investigate the compound’s physical and chemical properties to correctly identify and then synthesize the compound. The first step was to test the compounds solubility and create a solution with distilled water. Next, a pH test was conducted by testing the unknown compound using pH paper. Following, the flame test was used to determine the cation and the ion test was used to determine the anion, which concluded the compound to mostly be potassium nitrate. Next, a conductivity probe and pH probe were used to confirm the unknown compound to be potassium nitrate.
Ilyaas Farah 1711-60 1-31-16 Word count: 501 Sulfide Mining should be rejected Sulfide mining has a bad effect on both the economy and the environment. Sulfide mining is the process of removing copper, nickel, and other metals from sulfide ores. Minnesota 's traditional iron ore mining and sulfide mining are two very different types of mining. Sulfide mining has more environmental risks than Minnesota 's traditional iron ore mining. AMD (Acid Mine Drainage) is created from sulfuric acid.
After obtaining an homogeneous mixture, the flask was placed in an ice bath during five minutes next to a graduated cylinder containing 5.0 mL of concentrated sulfuric acid. The temperature of the ice bath was recorded to be 1.1 °C. Likewise, a second graduated cylinder containing 1.8 mL of nitric acid and 2.5 mL of sulfuric acid was immersed in the cold ice bath to keep the three different solutions at the same temperature. Thereafter, the cold 5.0 mL of H2SO4 were added to the erlenmeyer flask containing the acetanilide solution, which remained in the cold water for approximately another 4 minutes.
Swirl the solution to ensure that the NaOH is properly dissolved in the deionised water. B) Prepare an Oxalic Acid Solution (approximately 0,05M) 1. Place a clean, dry glass beaker on the electronic scale. 2. Determine the mass of the glass beaker.
Glacial acetic acid and acetic anhydride were added to the mixture while refluxing, which converted the lime colored solution into a clear mixture. The flask was cooled in an ice bath and the solution
3. Upon adding 20 drops of NaOH, a white precipitate was formed signifying acidic impurity. In the second NaOH mixture, about 20 drops were administered and no precipitate formed indicating that the ample is more pure than before. Data: Weight of flask = 75.10 grams Weight of the flask with solids =
Weighed 1 gram of NaC2H3O2 and mixed it with ionized water. Boiled 12 mL of 1.0M Acetic Acid added into a beaker containing the sodium carbonate on a hot plate until all the liquid is evaporated
Drinking water sources have been contaminated with explosive methane, as well as other dangerous substances, such as benzene and arsenic, that can cause cancer and other serious illnesses. Toxic chemicals, as well as erosion and runoff from drilling operations, have fouled
Buffer solutions of pH 4 and 7 6. Graduated cylinder - 100 mL 7. Volumetric flask with stopper - 250 mL 8. Two 100-mL beakers 9. Two 50-mL Burettes 10.
In this essay, the discussion will point to Nile contamination as a controversial issue and highlight some health problems which occur as consequences of using polluted water in Egypt. Likewise, the essay will raise some scientific methods to determine the percentage of heavy metal in water supported by example. Then it will suggest some chemical technical solutions to reduce the percentage of heavy metals in Nile and reuse it again for many purposes.