Case Study B. Historically, nitrate in aquatic environments has been quantitativ

Question

Case Study B. Historically, nitrate in aquatic environments has been quantitatively determined by first reducing it to nitrite using cadmium/copper. Then the nitrite is analyzed by a diazotization method. A newer method uses an enzyme (nitrate reductase) produced by corn to catalyze the reduction of nitrate to nitrite. Look up the SDS for cadmium: Go to the website of Fisher Scientific (a chemical supply company). https://www.fishersci.com/us/en/home html um metal. Be sure to choose On the top menu, click on "Safety Data Sheets' and then search for cadmi just elemental cadm Statements. ium metal, not one of its compounds. Describe the pictograms and read the Hazard Then write the name(s) of any Green Chemistry Principle which is/are applied in the newer method. If more than one principle is relevant, list first the one whose application is most direct or significant. Then list others.

Explanation / Answer

Prioritised green chemistry principles as per newer method are :

1) Less hazardous chemical synthesis - whether the method is practical or synthetic which are designed to produce or generate substance should posses little toxic substances to humans or environment.

2) Designing safer chemicals - Chemical products which are using must be designed to effect their desired function by not affecting environment.

3) Reduce derivatives - unnecessary production of derivatives should be avoided if possible because that needs more steps and so more chemicals.

4) Catalysis - Catalysts should be as selective as possible which are superior to stoichiometric reagents.

5) Design for degradation - Use of chemicals should be designed in a way that they do not pollute the environment.they should break down into non toxic products.

6) Inherently safer chemistry for accident prevention .

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