All calibration standards contain not only ketoprofen (the analyte), but also uracil as an additive. Our solvent system will be slightly acidic (acetonitrile:water 70:30 plus 0.1 % formic acid) and we will use a reverse-phase column. Which of the two compounds will elute first? Ketoprofen (image: https://webbook.nist.gov/) Uracil (image: https://webbook.nist.gov/)Single choice

Question Image
A

a. Ketoprofen

B

b. Uracil

C

c. Both will elute at the same time

D

d. Neither will elute in the sample time

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All calibration standards contain not only ketoprofen (the analyte), but also uracil as an additive.所有校准标准不仅含有酮洛芬（分析物），还含有尿嘧啶作为添加剂。 Our solvent system will be slightly acidic (acetonitrile:water 70:30 plus 0.1 % formic acid) and we will use a reverse-phase column.我们的溶剂系统将为微酸性（丙腈：水70：30加0.1%甲酸），并使用反相色谱柱。 Which of the two compounds will elute first?两种化合物中哪一种会先被洗脱？ Ketoprofen (image: https://webbook.nist.gov/) 酮普洛芬（图片来源：https://webbook.nist.gov/） Uracil (image: https://webbook.nist.gov/) 尿酸（图片：https://webbook.nist.gov/）

所有校准标准不仅含有酮洛芬（分析物），还含有尿嘧啶作为添加剂。 我们的溶剂系统将为微酸性（丙腈：水70：30加0.1%甲酸），并使用反相色谱柱。 两种化合物中哪一种会先被洗脱？ 酮普洛芬（图片：https://webbook.nist.gov/） 尿酸（图片：https://webbook.nist.gov/）

Question textUsing ONE word from the text, fill in the missing spaces in the following summary of the article. The author, David Hone acknowledges that zoos cannot be perfect. However, he points out that their work in conservation helps them to provide excellent sanctuaries for animals that can potentially suffer from the threat of Answer 1 Question 7[input] in the wild. He also goes on to state that school education programs have also improved greatly with more Answer 2 Question 7[input] communication in addition to outreach work. His third key point is the contribution that zoos make to Answer 3 Question 7[input] in various areas. In conclusion, Hone further justifies zoos by arguing that the world would be devalued without the role they have across the globe.

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