美国药典标准铅贮备液配制如下

Lead Nitrate Stock Solution—Dissolve 159.8mg of lead nitrate in 100ml of water to which has been added 1ml of nitric acid, then dilute with water to 1000ml.Prepare and store this solution in glass containers free from soluble lead salts

中国药典是100ml加5ml硝酸。

俺想问问，硝酸的量对溶液影响大吗，是不是按照两个方法配制的标准铅贮备液质量情况是一样的，可以混用？