Laboratory 3 Assignment (1)

.docx

School

University of Texas *

*We aren’t endorsed by this school

Course

Subject

Biology

Date

Feb 20, 2024

Type

docx

Pages

Uploaded by ChiefBravery9827

Laboratory 3 Assignment Name ： Zhiyu Song Student number ： 1009094114 Pra number ： 0017 Question 1. List the values you obtained for temperature (° C), pH, electrical conductivity (μS/ cm), dissolved oxygen (% saturation), suspended sediment concentration (mg/ L), and coliform concentrations (colonies per 1 mL of water). (9 marks) Temperature: 14.3° C pH:8.48 electrical conductivity: 684μS/ cm dissolved oxygen: 96% saturation or 9.7mg/L suspended sediment concentration: 0.108g-0.105g=0.003g 0.003g/180ml(sediment concentration) 3mg/0.18L=16.667mg/L coliform concentrations: 91 colonies in 1 mL of water Question 2. Convert your data into “quality units” using Figures 6-11 (on Pages 11- 16), and complete Table 1 (on Page 10). Then, based on Table 2 (also on Page 10), report and explain the overall water quality score in Highland Creek, as informed by your own samples. (9 marks) Text Units Quality Value Weighting Factor Contribution Dissolved O 2 % saturation 99 0.22 21.78 Coliforms colonies/1mL 0 0.18 0 pH pH 61 0.08 4.88 Temperature ° C 100 0.11 11 Suspended sediment concentration/ total solids mg/L 80 0.23 18.4

Electrical conductivity μS/cm 90 0.18 16.2 Note for Coliforms: From the figure, we know that when x is zero, y is 100, and when x is 10, y is 70. From this, we know that every time x increases by 10, y will decrease by 30. But because the title says extrapolate if necessary, the quality value cannot be lower than zero. So the quantity is 0. 21.78+0+4.88+11+18.4+16.2=72.26 The water quality is Good, because 72.26belongs to 70-89. Question 3. Refer to the Guidelines for Canadian Recreational Water Quality –Third Edition (specifically, Section 4.1). Assuming your coliform measurement is equal to the number of E. coli bacteria in your water sample, is the water in Highland Creek safe enough for recreational/primary contact activity? Explain. (4 marks) Geometric mean concentration (minimum of five samples): ≤ 200 E. coli/100 mL Single-sample maximum concentration: ≤ 400 E. coli/100 mL Since we have only one sample and not five and more, we can only use ： Single-sample maximum concentration: ≤ 400 E. coli /100 mL 91 colonies/1 ml x 100ml=910 colonies, 910 higher than 400 So, fresh recreational waters can not used for primary contact activities Question 4. Consider the scores in your water quality index. What changes in the watershed could improve these values? What should be the most immediate course of action given your data? For this question, you will have to do some independent research. Please keep this response to 10 sentences at maximum and cite your sources (using APA referencing style). (6 marks) The points that need to be changed in the water samples are as follows: In my sample, these three values below are taken too low compared to other data I have obtained, which is pH value, coliforms and suspended sediment concentration. And coliforms are the most immediate course of action. Faecal coliform, like other bacteria, can usually be killed by boiling water or by treating the water with chlorine . Also, if your water is acidic (low pH), you can

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version