马铃薯实验样品制备流程：清洗、切块、污染处理

实验所使用的马铃薯样品均来自长春某农贸市场，该市场所有流通的马铃薯均已通过国家质检。为了确保实验结果的准确性，我们需要对马铃薯进行制样。首先，将购买的马铃薯使用去离子水清洗干净，以消除尘土等污染物对实验的影响；然后，将马铃薯切成大小均匀一致的块状，并对每块样品进行称重，以确保所有样品质量相同；最后，将这些样品放入配置好的Cr溶液中浸泡，进行污染处理。

The potato samples used in the experiment were obtained from a farmer's market in Changchun, where all potatoes sold have passed national quality inspection. Therefore, we need to prepare the potato samples by washing the purchased potatoes with deionized water to eliminate the influence of pollutants such as dust. After that, the potatoes were uniformly cut into pieces, and each sample was weighed to ensure the same quality. Finally, they were contaminated by soaking them in a Cr solution that had been prepared beforehand.