鉛(qian)(qian)(qian)(qian)(qian)(qian)在(zai)(zai)地殼中(zhong)含量不(bu)大,自然(ran)(ran)界中(zhong)存(cun)在(zai)(zai)很(hen)少量的(de)(de)(de)(de)天然(ran)(ran)鉛(qian)(qian)(qian)(qian)(qian)(qian).但由(you)于(yu)含鉛(qian)(qian)(qian)(qian)(qian)(qian)礦物(wu)聚集,熔點又(you)很(hen)低(328℃),使鉛(qian)(qian)(qian)(qian)(qian)(qian)在(zai)(zai)遠古時代就(jiu)被人(ren)們所利用(yong)(yong)(yong)了(le).在(zai)(zai)所有(you)已(yi)(yi)知毒性物(wu)質中(zhong),書上(shang)記(ji)載最多的(de)(de)(de)(de)是(shi)(shi)鉛(qian)(qian)(qian)(qian)(qian)(qian).古書上(shang)就(jiu)有(you)記(ji)錄認為(wei)用(yong)(yong)(yong)鉛(qian)(qian)(qian)(qian)(qian)(qian)管輸送飲用(yong)(yong)(yong)水有(you)危險性.公眾接(jie)觸鉛(qian)(qian)(qian)(qian)(qian)(qian)有(you)許(xu)多途徑(jing).近年(nian)來公眾主要關心石油產品中(zhong)含鉛(qian)(qian)(qian)(qian)(qian)(qian)問題.顏料(liao)(liao)含鉛(qian)(qian)(qian)(qian)(qian)(qian),特(te)別是(shi)(shi)一些老牌(pai)號(hao)的(de)(de)(de)(de)顏料(liao)(liao)含鉛(qian)(qian)(qian)(qian)(qian)(qian)較高,已(yi)(yi)經(jing)造成許(xu)多死(si)亡事件,因此有(you)的(de)(de)(de)(de)****特(te)別制定(ding)了(le)環境標(biao)準規定(ding)顏料(liao)(liao)中(zhong)鉛(qian)(qian)(qian)(qian)(qian)(qian)的(de)(de)(de)(de)含量應控(kong)制在(zai)(zai)600PPM之內.一般飲用(yong)(yong)(yong)水中(zhong)鉛(qian)(qian)(qian)(qian)(qian)(qian)含量的(de)(de)(de)(de)安(an)全界限(xian)是(shi)(shi)100微(wei)(wei)(wei)克(ke)(ke)/升,而****可接(jie)受水平(ping)是(shi)(shi)50微(wei)(wei)(wei)克(ke)(ke)/升.后來又(you)進(jin)一步規定(ding)自來水中(zhong)可接(jie)受的(de)(de)(de)(de)鉛(qian)(qian)(qian)(qian)(qian)(qian)****濃(nong)(nong)(nong)度(du)為(wei)50微(wei)(wei)(wei)克(ke)(ke)/升(0.05毫克(ke)(ke)/升).此外,為(wei)了(le)研究(jiu)鉛(qian)(qian)(qian)(qian)(qian)(qian)對人(ren)體健康(kang)的(de)(de)(de)(de)影響,科(ke)學(xue)(xue)家(jia)著手檢測人(ren)體血樣的(de)(de)(de)(de)鉛(qian)(qian)(qian)(qian)(qian)(qian)濃(nong)(nong)(nong)度(du),作為(wei)是(shi)(shi)否鉛(qian)(qian)(qian)(qian)(qian)(qian)中(zhong)毒的(de)(de)(de)(de)先(xian)期指標(biao).數據(ju)表明(ming):如果飲用(yong)(yong)(yong)水接(jie)近50微(wei)(wei)(wei)克(ke)(ke)/升,那么(me)該病(bing)人(ren)血樣的(de)(de)(de)(de)鉛(qian)(qian)(qian)(qian)(qian)(qian)濃(nong)(nong)(nong)度(du)約在(zai)(zai)30微(wei)(wei)(wei)克(ke)(ke)/升以上(shang).吃奶的(de)(de)(de)(de)嬰兒要求應該更為(wei)嚴格,平(ping)均血鉛(qian)(qian)(qian)(qian)(qian)(qian)濃(nong)(nong)(nong)度(du)要不(bu)超(chao)過10--15微(wei)(wei)(wei)克(ke)(ke)/升.鉛(qian)(qian)(qian)(qian)(qian)(qian)是(shi)(shi)一種化學(xue)(xue)元(yuan)(yuan)素(su),其(qi)化學(xue)(xue)符號(hao)源(yuan)于(yu)拉(la)丁文,化學(xue)(xue)符號(hao)是(shi)(shi)Pb(拉(la)丁語Plumbum),原(yuan)子(zi)(zi)量207.2,原(yuan)子(zi)(zi)序(xu)數為(wei)82.鉛(qian)(qian)(qian)(qian)(qian)(qian)是(shi)(shi)所有(you)穩定(ding)的(de)(de)(de)(de)化學(xue)(xue)元(yuan)(yuan)素(su)中(zhong)原(yuan)子(zi)(zi)序(xu)數****的(de)(de)(de)(de).鉛(qian)(qian)(qian)(qian)(qian)(qian)為(wei)帶藍(lan)色的(de)(de)(de)(de)銀白色重(zhong)金屬,它(ta)有(you)毒性,是(shi)(shi)一種有(you)延(yan)伸(shen)性的(de)(de)(de)(de)主族金屬.熔點327.502C,沸(fei)點1740C,密(mi)度(du)11.3437克(ke)(ke)/厘米3,硬度(du)1.5,質地柔軟,抗(kang)張(zhang)強度(du)小.更多關于(yu)產品信息,歡迎來電咨詢(xun),期待你(ni)的(de)(de)(de)(de)光(guang)臨!