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<h1>二氧化硫?qū)θ说奈：?/h1> <div id="6iidgze" class="ar_title_b"> <div id="1gd9kef" class="sub_title clear"> <span id="w9usby3" class="sp2 c6 fl">時(shí)間：<time class="fxtime">2017-06-21 09:28:19</time></span> <span id="3z3pde4" class="sp1 c6 fl"><em id="zuozhe" class="noshow">曉瓊</em><em class="user_id noshow">996</em>由 <em class="nickname"></em> 分享</span> <span id="nstrxqn" class="fl arc_btn"></span> </div> </div> </div> <div id="b3ojsx8" class="y_ju"></div> <div id="9n2gznk" class="con_article con_main" id="contentText"> <p>二氧化硫?qū)θ说奈：?/p><p> 　　大棚黃瓜二氧化硫危害是不可逆的危害，所以只能是以預(yù)防加緩解為主，平時(shí)多注意，避免大棚黃瓜二氧化硫危害的發(fā)生?，F(xiàn)在就跟著學(xué)習(xí)啦小編一起來看一看二氧化硫?qū)θ说奈：?，資料僅供參考。</p><h2> 　　二氧化硫?qū)θ说奈：?/h2><p> 　　SO2被人體吸入呼吸道后，因易溶于水，故大部分被阻滯在上呼吸道。對(duì)支氣管和肺部有明顯的刺激癥狀，使肺組織受到傷害。SO2還可被人體吸收進(jìn)入血液，對(duì)全身產(chǎn)生毒性作用，它能破壞酶的活力，影響人體新陳代謝，對(duì)肝臟造成一定的損害。同時(shí)慢性鼻炎、牙齒酸蝕癥都是易見癥狀，最重要的是SO2還具有促癌性。</p><p> 　　SO2是一種無色具有強(qiáng)烈刺激性氣味的氣體，易溶于人體的體液和其他黏性液中，長(zhǎng)期的影響會(huì)導(dǎo)致多種疾病，如：上呼吸道感染、慢性支氣管炎、肺氣腫等，危害人類健康。SO2在氧化劑、光的作用下，會(huì)生成使人致病、甚至增加病人死亡率的硫酸鹽氣溶膠，據(jù)有關(guān)研究表明，當(dāng)硫酸鹽年濃度在10μg/m3 左右時(shí)，每減少10%的濃度能使死亡率降低0.5%;</p><h2> 　　大棚黃瓜二氧化硫危害的防治方法</h2><p> 　　●主要癥狀</p><p> 　　主要危害葉片，二氧化硫遇水或在空氣濕度較大時(shí)，就轉(zhuǎn)化為亞硫酸，它能直接破壞蔬菜的葉綠體。受害的葉片在氣孔多的部位出現(xiàn)斑點(diǎn)，嚴(yán)重時(shí)，整個(gè)葉片呈水浸狀，并逐漸褪綠。葉緣及葉脈間變白，漂白部分隨接觸二氧化硫時(shí)間的延長(zhǎng)而逐漸擴(kuò)展至葉脈，葉片逐漸干枯。</p><p> 　　●發(fā)病原因</p><p> 　　來源于室內(nèi)加溫時(shí)泄露的煤煙、生雞糞和生餅肥分解時(shí)釋放的二氧化硫，在工廠附近建的大棚可能還要受到大氣污染帶來的二氧化硫?yàn)楹?。蔬菜?duì)二氧化硫的抗性與環(huán)境條件有很大的關(guān)系，溫暖濕潤(rùn)、光照充足、水分供應(yīng)良好時(shí)最易發(fā)生二氧化硫?yàn)楹ΑＲ驗(yàn)檫@些條件都有利于氣孔開放，使二氧化硫容易進(jìn)入葉內(nèi)，也有利于二氧化硫轉(zhuǎn)化為亞硫酸和硫酸。干旱、光照不足使氣孔關(guān)閉，反而可增強(qiáng)蔬菜對(duì)二氧化硫的抗性。</p><p> 　　●防治方法：</p><p> 　　1.不要在煉油廠、化工廠和熱電廠附近建溫室，盡量不在溫室內(nèi)用火爐加溫。避免強(qiáng)光高溫條件，以降低氣孔開放程度，增強(qiáng)葉片的抗性。不施未腐熟的牛、雞糞等農(nóng)家肥。</p><p> 　　2.補(bǔ)救措施：在溫室中發(fā)現(xiàn)二氧化硫中毒癥狀后，要在不影響蔬菜正常生長(zhǎng)的條件下，盡量加大通風(fēng)量。用0.5%的石灰水噴灑葉面，有一定的緩解作用。用石灰硫黃合劑或0.5%合成洗滌劑噴灑植株也有一定療效。</p><h2> 　　大氣中二氧化硫的危害</h2><p> 　　二氧化硫具有酸性，可與空氣中的其他物質(zhì)反應(yīng)，生成微小的亞硫酸鹽和硫酸鹽顆粒。當(dāng)這些顆粒被吸入時(shí)，它們將聚集于肺部，是呼吸系統(tǒng)癥狀和疾病、呼吸困難，以及過早死亡的一個(gè)原因。如果與水混合，再與皮膚接觸，便有可能發(fā)生凍傷。與眼睛接觸時(shí)，會(huì)造成紅腫和疼痛。</p><p> 　　二氧化硫是大氣中主要污染物之一，是衡量大氣是否遭到污染的重要標(biāo)志。世界上有很多城市發(fā)生過二氧化硫危害的嚴(yán)重事件，使很多人中毒或死亡。在我國(guó)的一些城鎮(zhèn)，大氣中二氧化硫的危害較為普遍而又嚴(yán)重。</p><p> 　　二氧化硫進(jìn)入呼吸道后，因其易溶于水，故大部分被阻滯在上呼吸道，在濕潤(rùn)的粘膜上生成具有腐蝕性的亞硫酸、硫酸和硫酸鹽，使刺激作用增強(qiáng)。上呼吸道的平滑肌因有末梢神經(jīng)感受器，遇刺激就會(huì)產(chǎn)生窄縮反應(yīng)，使氣管和支氣管的管腔縮小，氣道阻力增加。上呼吸道對(duì)二氧化硫的這種阻留作用，在一定程度上可減輕二氧化硫?qū)Ψ尾康拇碳?。但進(jìn)入血液的二氧化硫仍可通過血液循環(huán)抵達(dá)肺部產(chǎn)生刺激作用。</p><p> 　　二氧化硫可被吸收進(jìn)入血液，對(duì)全身產(chǎn)生毒副作用，它能破壞酶的活力，從而明顯地影響碳水化合物及蛋白質(zhì)的代謝，對(duì)肝臟有一定的損害。動(dòng)物試驗(yàn)證明，二氧化硫慢性中毒后，機(jī)體的免疫受到明顯抑制。</p><p> 　　二氧化硫濃度為10～15ppm時(shí)，呼吸道纖毛運(yùn)動(dòng)和粘膜的分泌功能均能受到抑制。濃度達(dá)20ppm時(shí)，引起咳嗽并刺激眼睛。若每天吸入濃度為100ppm8小時(shí)，支氣管和肺部出現(xiàn)明顯的刺激癥狀，使肺組織受損。濃度達(dá)400ppm時(shí)可使人產(chǎn)生呼吸困難。二氧化硫與飄塵一起被吸入，飄塵氣溶膠微?？砂讯趸驇У椒尾渴苟拘栽黾?～4倍。若飄塵表面吸附金屬微粒，在其催化作用下，使二氧化硫氧化為硫酸霧，其刺激作用比二氧化硫增強(qiáng)約1倍。長(zhǎng)期生活在大氣污染的環(huán)境中，由于二氧化硫和飄塵的聯(lián)合作用，可促使肺泡纖維增生。如果增生范圍波及廣泛，形成纖維性病變，發(fā)展下去可使纖維斷裂形成肺氣腫。二氧化硫可以加強(qiáng)致癌物苯并(a)芘的致癌作用。據(jù)動(dòng)物試驗(yàn)，在二氧化硫和苯并(a)芘的聯(lián)合作用下，動(dòng)物肺癌的發(fā)病率高于單個(gè)因子的發(fā)病率，在短期內(nèi)即可誘發(fā)肺部扁平細(xì)胞癌。<br/></p><p> 猜你感興趣：</p><p> 1.<a _href="http://lpo831.com/shenghuo/jiankang/3505281.html" href="http://lpo831.com/shenghuo/jiankang/3505281.html" target="_blank">放鞭炮對(duì)人的危害</a></p><p> 2.<a _href="http://lpo831.com/shenghuo/jiankang/1622678.html" href="http://lpo831.com/shenghuo/jiankang/1622678.html" target="_blank">環(huán)境污染對(duì)健康影響的論文</a></p><p> 3.<a _href="http://lpo831.com/yuwen/yuedudaan/2413932.html" href="http://lpo831.com/yuwen/yuedudaan/2413932.html" 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