Wembury environmental report

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RESULTS AND DISCUSSION 4 3. Summary of the Results 4 3. Critical Interpretation of the Analytical Data Quality 4 3. Environmental Significance of the Water Data 5 3. Environmental Significance of the Sediment Data 6 3. Hypothetically, the study is designed to critically analyze the data and determine the significance of water and sediment data to the environment. Secondly, the significance of the information collected will be compared with the Legislative guidelines that have been put in place to address issues of environmental protection and conservation, (He & Nguyen, 2018). FIELDWORK The fieldwork site is Wembury Field. Here, the collection of water and sediment sample commenced from the Wembury Stream down from the southern edge of the Wembury Village down towards the foreshore area. Collection of data will involve water samples and sediment samples.

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Recorded data were water temperature, conductivity, dissolved oxygen, the pH value, flow rate, suspended solids and the Eh value. In water 6 elements were tested and inferred; NO3-N, PO4-P, SiO2-Si, Mg, Fe, and Zn. In sediment, only 5 elements were tested, PO4-P, SiO2-Si, Mg, Fe, and Zn. Table1: Results for Water Data SITE NO3-N (mg L-1) PO4-P (mg L-1) SiO2-Si (mg L-1) Mg (mg L-1) Fe (mg L-1) Zn (mg L-1) 1 7. Data in red is below LOD so therefore calculated as LOD/2 Table 2: Results for Sediment Data SITE PO4-P (mg kg-1) SiO2-Si (mg kg-1) Mg (mg kg-1) Fe (mg kg-1) Zn (mg kg-1) 1 410±83 680±24 5880±106 23000±139 102±1 2 380±180 640±39 8700±122 23400±474 96. The precision of the values based on the standard deviation suggests that Magnesium’s (Mg) data is not accurate when compared with the Certified CRM values.

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The detection values of Zinc and Iron was at 170 mg kg-1 and 37300 mg kg-1 respectively. This data is was sensitive to the certified values. Table 3: CRM Experimental Values, CRM Certified Values and LODs ELEMENTS Mg Fe Zn CRM EXPERIMENTAL VALUES 6930±42 mg kg-1 37300±902 mg kg-1 170±3 mg kg-1 CRM CERTIFIED VALUES 5900±350 mg kg-1 39000±1700 mg kg-1 185±20 mg kg-1 LODs 0. mg L-1 0. The percentage of dissolved oxygen in water was 93. which was equivalent to 10. mg L-1. The mean pH value of water sample collected in the three sites was 8. which is relatively highly considering the fact that there is settlement around the area. These pollutions are influenced by human activities such as agriculture where rainfall washes livestock feacal materials to the streams. The urban drainage has been connected to the rivers and streams and sewages are wrongly connected to surface water thus leading to pollution.

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In Wembury, the iron (Fe) compounds present are Fe2+ compounds which are highly soluble in water. The water has iron compounds though have low solubility value compared to other metal present. This compound contributes to the hardness of water. mg/L 18. mg L-1 pH Value 8. Dissolved Oxygen 10. mg/L 14. mg/L Flow rate 0. The mean value of Iron (Fe) evidently shows that the sediments had a high content of iron compounds. The least component was evident in the sediments was Zinc (Zn) which was 99. mg kg-1. The presence of the metals and nutrients in water is as a result of human activities as well as heavy rainfall that leads to short term population, (Foster, Grieve, & Christmas, 2009). The rainfall washes feacal materials downstream into the beach and various freshwater catchment areas.

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Table 5: Wembury Sediment Data Compared to East Devon Sediment Data Parameters Wembury Sediment Data East Devon Sediment Data, (Chantal Brown Consulting, 2016) Suspended Solids 6. mg/L 4. mg/L Concentration of Phosphates (mg kg-1) 406. Concentration of Iron Compounds (mg kg-1) 24766. Concentration of Mg (mg kg-1) 6610 9833 Concertation of Zn (mg kg-1) 99. Mg, Zn and Fe are classified as hazardous substances. Therefore, the Wembury water fails the test since it contains these elements, (Comber et al, 2008). There is a proposed EGSs guideline that addresses zinc substances. According to the guideline, zinc exist in the +2-oxidation state in forms that are dependent of the physiochemical parameters such as pH, (Comber et al, 2008). Legislation on sediment quality guidelines are less developed though various entities are developing regulatory instruments that will help in sediment management.

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East Devon Rural Diffuse Pollution Project.  East Devon Catchment Partnership. Retrieved from https://catchmentbasedapproach. org/wp-content/uploads/2018/12/East-Devon-Diffuse-Pollution-Project-Final-Report. pdf Comber, S. wat2. Foster, I.  D. Grieve, I.  C. uk/maps/search/wembury+stream/@50. m/data=!3m1!1e3?hl=en-GB He, C. Nguyen, D. Erodibility study of sediment in a fast-flowing river.  International Journal of Sediment Research. et al. Proposed EQS for Water Framework Directive Annex VIII Substances: Zinc (For consultation). Retrieved from https://www. wfduk. org/sites/default/files/Media/Zinc%20-%20UKTAG.

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