Correction: Wu et al. A Novel Truncated DNAzyme Modified Paper Analytical Device for Point-of-Care Test of Copper Ions in Natural Waters. Chemosensors 2022, 10 , 72

The authors make the following corrections to the published paper [...]

In paragraph 3, the sentence "Recently, Liu et al. [15] has selected one kind of DNAzyme named CLICK-17, a long single-stranded DNA with 76 bases (76-nt)" should be changed to "Recently, Liu et al. [15] has selected one kind of DNAzyme named CLICK-17, a long single-stranded DNA with 79 bases (79-nt)".
In paragraph 3, the sentence "However, CLICK-17 ′ s fabrication cost is a bit expensive due to its 76 bases."should be "However, CLICK-17 ′ s fabrication cost is a bit expensive due to its 79 bases." In paragraph 3, the sentence "Because 18-nt CLICK-T is much shorter than 76-nt CLICK-17" should be "Because 18-nt CLICK-T is much shorter than 79-nt CLICK-17".

Changes to Section 3.1: The Feasibility of Copper Detection by the CLICK-T Modified PADs
In the original article, due to the inaccurate setting of the electrophoresis parameter, there was a mistake in Figure 3

Changes to Acknowledgments
The sentence "We would like to thank Prof. Huang-zhong Yu in Department of Chemistry of Simon Fraser University (Canada) for his help in the design and decoration of DNAzyme on paper."should be "We would like to express our gratitude to Huang-Zhong Yu and Kun Liu in the Department of Chemistry at Simon Fraser University (Canada) for their helpful discussions on the design and decoration of the CLICK-17 DNAzyme".

Changes to Supplementary Page 9
In line 6 of paragraph 2, "generating the desirable sequence CLICK-T which was 19 bases" should be "generating the desirable sequence CLICK-T which was 18 bases".
In line 4, Kd was not shown; it should be added as "28.12 ± 2.77 nM", which is same in paragraph 2 of page 9.

Changes to Supplementary Table S2
All the red can be deleted and changed to black.

Changes to Supplementary Figure S6
All the red can be deleted and changed to black.

Changes to Section Supplementary Materials
On page 12, the heading in Table S3 was not shown; it should be added as "Table S3.The pH, dissolved oxygen, ion concentrations of the water samples".

Changes to Acknowledgments
The sentence "We would like to thank Prof. Huang-zhong Yu in Department of Chemistry of Simon Fraser University (Canada) for his help in the design and decoration of DNAzyme on paper."should be "We would like to express our gratitude to Huang-Zhong Yu and Kun Liu in the Department of Chemistry at Simon Fraser University (Canada) for their helpful discussions on the design and decoration of the CLICK-17 DNAzyme".

Changes to Supplementary Page 9
In line 6 of paragraph 2, "generating the desirable sequence CLICK-T which was 19 bases" should be "generating the desirable sequence CLICK-T which was 18 bases".
In line 4, Kd was not shown; it should be added as "28.12 ± 2.77 nM", which is same in paragraph 2 of page 9.

Changes to Supplementary Table S2
All the red can be deleted and changed to black.

Changes to Supplementary Figure S6
All the red can be deleted and changed to black.
as published.The corrected Figure 3 appears below.