Determination of nitrogen dioxide content of the atmosphere Lab Report

Determination of nitrogen dioxide content of the atmosphere - Lab Report Example Apparatus include sampling probe, absorber, gas drying tube, air-metering device, thermometer, manometer, air pump, spectrophotometer, and stopwatch. Reagent grade chemicals have been used. Water free from nitrite and deionized according to specification D 1193 for type I or II reagent water has been used. Anhydrous sulfanilic acid has been used as the absorbing reagent, N-(1-Naphthyl)-Ethylenediamine Dihydrochloride stock solution (0.1 percent), Sodium Nitrite standard solution (0.0246 g/L) and NO2 permeation device were reagents and materials that were used in the experiment. 5.0012 g of anhydrous sulfanilic acid was dissolved in 1 L of water containing 140 mL glacial acetic acid. The process was gently heated to speed up the process. 20 mL of the of N-(1-naphthyl)-ethylenediamine dihydrochloride 0.1 % stock solution and 10 mL acetone were added, and diluted to 1 L. 0.1 g of the reagent was dissolved in 100 mL water.Calibration and StandardizationThe flowmeter was calibrated using practice D 3195. The gas meter was calibrated using test method D 1071. Standardization was based on observation. 0.82 mol of NaNO2 produced the same color as 1 mol NO2. 1 mL working standard solution contains 24.6 Â µg NaNO2. The amount of NO2 given by (24.6/69.1)x(46.0/0.82), which is 20 Â µg NO2. Standard conditions of 101 kPa and 25C were taken, and the molar gas volume was 24.47L (ASTM International 3). Graduated amounts of NaNO2 solution were added to a series of 25mL volumetric flasks up to 1 mL.

Research paper Case Study Example | Topics and Well Written Essays - 1250 words - 1

Research paper - Case Study Example For each of these diseases a physical examination will have to be done to achieve a proper diagnosis of each. A 16-year-old female presented with her mother at the doctor’s office. The patient states that the following subjective symptoms that are bothering her are that she feels extremely tired and fatigued. She has a lack of appetite. She appears to have ‘tomato red cheeks’ as if someone slapped her. She also states that she has had a fever for the past 24 hours. This is according to the mother for she sais that she gave her daughter Tylenol for the fever it was effective for a short while, but fever comes back. They also share that they just moved to California three months ago. The patient also states that she began working for a preschool as a teacher’s helper and that no child is present with any rashes. Patient also states that she has had her period (menses) one week ago. Her mother asks a question about her own health for she happens to be five months pregnant. The three differential diagnoses that this patient could be suffering from are Mononucleosis, Fifth Disease, and Kawasaki’s Disease. This 16 year old female is exhibiting prodromal symptoms (symptoms that occur before the actual onset of the disease) of these three diseases. Diagnosis- Characterized by malaise, anorexia, chills and fever which is a prodromal symptom, pharyngitis and lymphadenopathy. Occasionally the disorder comes on abruptly with high fever. Seek help when severe pharyngitis lasts for five to seven days. Only 90% of patients suffer from lymphadenopathy even though the patient shows no signs at this moment. Rashes that appear look like Rubella when it may appear. Screening- Most persons during adolescence and young adulthood and in the upper socioeconomic classes in developed countries. Relatively asymptomatic when it occurs during childhood and confers complete immunity to