How much of the lead standard solution should be taken for the limit test for heavy metals in this experiment?

试计算葡萄糖重金属检查中标准铅溶液的取用量。

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And about eight million or so were due to high levels of lead, and that exceeds the government standard for lead paint on toys.

NPR: Do Home Lead-Testing Kits Work?

Poor took a lead role in creating a rival standard called Zigbee, which moves data only one-fourth as fast as Bluetooth but can handle hundreds of devices at once.

FORBES: EMBEDDED NETWORKS

That is not the same as, nor does it lead to, an austere economy or standard of living.

FORBES: We Are All Austerians Now