第一段:背景知識介紹
陜西師范大學(xué)環(huán)境學(xué)院老師需要做木頭的實(shí)驗(yàn),要求是要將木質(zhì)部研磨成粉末狀,然后通過穩(wěn)定同位素的方法測木頭里面的重金屬及年輪。一般情況下,杉木(冷杉、云杉、柏樹)的木質(zhì)結(jié)構(gòu)松脆,采用上海凈信多樣品組織研磨儀研磨鋼罐容易研磨,但是老師要去除重金屬對樣品的污染影響,采用塑料罐進(jìn)行試驗(yàn)。
(附上樣品圖片)
第二段:描述一下樣品研究原理
杉木(冷杉、云杉、柏樹)的木質(zhì)結(jié)構(gòu)松脆,用鋼珠及鋼罐非常容易研磨,要去除重金屬對樣品的污染影響,采用陶瓷珠和塑料罐進(jìn)行實(shí)驗(yàn)。還是同樣的原理,把樣品和陶瓷珠加入塑料罐中,放入儀器中,設(shè)置頻率和時間,然后研磨。
第三段:樣品具體研磨方法
實(shí)驗(yàn)步驟:
步驟1:樣品和研磨塑料罐
步驟2 :將樣本放入塑料罐中,然后再將塑料罐放入凈信研磨儀上,
步驟3:設(shè)置參數(shù)研磨頻率,時間就可研磨成粉狀,
步驟4:從凈信研磨儀上取出樣本,將塑料罐打開倒出樣品。
實(shí)驗(yàn)結(jié)果(放前后研磨對比圖)
研磨后的粉狀樣本,研磨細(xì)度可以滿足實(shí)驗(yàn)要求。
注意:樣品必須在凍干機(jī)中凍干幾小時以上,要不然研磨的時候木頭中的纖維不易研磨粉碎,且木質(zhì)部中的油脂容易粘貼在研磨罐壁和研磨珠上,不易清理下來回收樣品。
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