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2025-07-25 02:27本頁面
【正文】 eriment measured value of ABS into the equation,we can get the value of x. x= mg/l The concentration of heavy metals in soil is :VI. Conclusion and discussionThis experiment ,first,we use the given Cu standard stock solution(10 mg/l) to get different concentration of standard solution . Our estimated concentration of standard solution respectively 0 mg/l, mg/l, mg/l, mg/l, mg/l, mg/l of Cu。 then we measure the absorbance of this group of Cu standard solution by AAS,thus we can get the Standard curve. At last, the sample solution is analyzed using the same procedure and conditions as for the standard curve. The concentration of Cu is obtained from the standard curve based on the absorbance.2. Conclusion 1,we can see from the front graph , the correlation coefficient(R) is , basically meet the requirements . 2. In the front chart we can see that at 0 mg/l the absorbance appears the negative value , In theory, this is not allowed , but in our experiment the negative value is approach to zero that we do not think it has a very big impact and is available. relative standard deviation of 0 mg/l is % , generally such a large error do not meet the requirements . 4. Our experiment basically meet the purpose of the activity.3. advices we can improve the experimental accuracy by control the Acetylene time is allowed, I hope we can do a series of repetitive experiment ,then it will reduce the errors .
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