





摘要:評述了近幾年不同環境介質中銻的形態分析方法,其中,電感耦合等離子體質譜法具有檢出限低、靈敏度高、穩定性好、分析速度快等優點,在銻的形態分析領域受到越來越多的關注。在形態分析之前,從復雜基質中提取不同形態銻,并保持其價態的穩定性是關鍵,靈敏的檢測技術與高效的樣品前處理技術以及分離技術的融合,為解決這一問題提供了思路。近年來,聯用技術已經廣泛應用于大氣、水體、土壤和沉積物等環境樣品中銻形態的檢測。最后,探討了該領域面臨的挑戰并對其未來的發展方向進行了展望。
關鍵詞:銻;形態分析;前處理技術;液相色譜;聯用技術;綜述
中圖分類號:X703 文獻標志碼:A 文章編號:1002-4026(2023)04-0122-12
開放科學(資源服務)標志碼(OSID):
Review on the analytical technique for antimony speciation in environmental media
XU Lei1, ZHAO Rusong1, JING Chuanyong2, WANG Xia1*
(1.Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China;2.School of environmental science and engineering, Shandong University, Qingdao 266237, China)
Abstract∶This study reviews the speciation analysis methods of antimony indifferent environmental media in recent years. Inductively-coupled plasma mass spectrometry is widely used in the antimony speciation analysis because of its advantages such as low detection limit, high sensitivity, and good stability. Before the speciation analysis, extracting different forms of antimony from a complex matrix and maintaining its valence stability are essential. This can be achieved by combining the sensitive detection technology, efficient sample pretreatment techniques, and separation methods. In recent years, the combined techniques have been widely used for the determination of antimony in various environmental samples. Moreover, the challenges in this field and the development prospect of antimony speciation analysis method are discussed.
Key words∶antimony;speciation analysis;pretreatment techniques;liquid chromatography;hyphenated technology;review
銻(antimony, Sb)是一種重要的金屬元素,在合金、醫藥、電子材料、電池、煙火材料、抗蟲藥劑、半導體、搪瓷、化纖工業等方面被大量地應用,其最主要的用途是制作耐火材料和阻燃劑。銻及其化合物的大量使用使得相當數量的各種價態的銻及其化合物進入大氣、水和土壤等環境體系,導致銻污染越來越嚴重。隨著銻的潛在毒性和致癌性的發現,銻及其化合物在自然界中的存在形態和含量引起了人們的廣泛關注。巴塞爾公約中,銻和銻化合物被列為應加控制的廢物類別,美國和歐盟將銻列為優先控制污染物[1]。
銻在各個環境介質中的遷移性、毒性、生物有效性等與其在環境中的含量和存在形態緊密相關,已有國內外學者對環境介質中不同形態銻的分離和形態分析方法進行了研究。相關綜述包括水體中銻的形態及其遷移轉化規律[2]、土壤和沉積物中銻總量分析及形態分析的預處理方法和分析方法[3]、銻在環境樣品中的化學行為、分析方法和去除技術[4]以及基于HPLC-ICP-MS聯用技術的多元素形態分析等[5]。
本文對環境介質和生物體中重金屬銻的存在形態和遷移轉化、銻形態分析的前處理和分析方法進行了綜述,著重介紹了大氣、水體、土壤及沉積物中銻的存在形態和遷移轉化規律,復雜樣品基體中銻形態的分離和富集技術以及銻形態的定量分析技術等,并探討了該領域面臨的困難及未來的發展方向。
1 銻在環境介質中的遷移轉化和存在形態
研究銻的遷移轉化,可以明確銻的來源、分布、形態、環境及生態影響和歸宿,是評價銻的環境化學行為和生物效應的基礎,具有十分重要的毒理學意義。銻在自然界中主要以礦物的形式存在[4],因銻與砷的化學性質相似[6],都是親硫金屬,因此在自然界中銻的硫化物是其主要的礦物形態[2,7]。
隨著采礦業和金屬冶煉工業的發展,采礦產生的大量廢石和冶煉產生的尾礦廢渣暴露在地表環境中,在雨水沖刷和地表水的作用下,銻從礦物和巖石中溶解出來并遷移至各類環境介質中,從而對礦區及其周圍環境造成嚴重危害[8-12]。
1.1 大氣環境中的銻形態
銻通過自然過程和人類活動兩個途徑進入到大氣環境中。自然過程包括火山噴發、地質活動產生的細顆粒等。化石燃料的燃燒是銻進入大氣環境非常重要的人為排放過程[13]。此外,銻礦的大量開采和冶煉、道路交通中汽車剎車片的磨損、汽油的燃燒都是大氣環境中銻的主要釋放途徑。Chang 等[14]的研究顯示交通區域城市街道塵埃中銻的濃度顯著高于居民區和工業區,而且隨著道路密度的增加,城市街道粉塵中銻的濃度也顯著增加。
有研究發現,垃圾焚燒爐排放的煙道氣中的銻主要以Sb(V)的形態存在[15-16]。而通過燃料燃燒過程排放到大氣中的銻除了以Sb(III)和Sb(V)形式存在,還存在SbCl3(g)和SbO2H2(g)等其他形態[17]。
1.2 水和沉積物中銻的存在形態
銻在未受污染的天然水體中質量濃度極低,一般在ng/L或μg/L量級[18],屬于微量元素。水環境中的銻主要通過巖石風化、土壤徑流、生物作用、大氣沉降等自然過程[19]以及化石燃料燃燒、銻礦的開采和使用、銻產業的廢物排放等人類活動釋放到水環境中。值得注意的是,人類活動主導了銻釋放到水體環境中的過程,是目前銻污染最主要的來源[20]。地表水與地下水中銻的來源有所不同:地表水中的銻主要來源于采礦活動污染的土壤以及巖石風化和冶煉過程,其含量與水源的地理位置及水體物理化學條件、水體與污染源的距離相關[2];地下水中的銻主要受采礦廢渣淋溶和礦坑滲濾液等的影響[21]。
銻在水體環境的遷移過程中,主要以Sb(III)、Sb(V)和有機銻的形式存在,其中Sb(III)和Sb(V)以氧化物的形式存在于水體環境中[22]。銻的具體存在形態與水環境中溶解氧(DO)的含量即氧化還原條件密切相關:在富氧環境中,水體處于氧化條件,主要以Sb(V)的形式存在;在厭氧環境中,水體處于還原條件,主要以Sb(III)的形式存在[19]。
沉積物中的銻與水環境中銻的存在形式相關,主要為Sb(III)和Sb(V)[23]。有研究表明,銻在沉積物中存在可交換態、可氧化態、可還原態和殘渣態等4種形態,這4種形態受酸堿度、氧化還原電位(Eh)、陽離子交換能力(CEC)、溶解氧(DO)等環境條件的影響而保持動態分布平衡,且不同形態的銻之間存在顯著的正相關性[24]。
1.3 土壤環境中銻的形態
土壤中的銻主要來源于人類活動,如與礦物篩選、開采、利用有關的工業產業以及含銻產品的應用。除此之外,大氣中含銻顆粒物的沉降、含銻巖石的風化以及含銻廢水、污水中銻的遷移也是土壤中銻的一個重要來源。研究發現,銻主要存在于土壤表層中,且均以Sb(V)的氧化態為主要存在形式[25]。土壤的物理化學條件復雜,銻在土壤中的存在形態與土壤土質密切相關。
1.4 生物體內銻的存在形態
人類或動物與含銻的環境介質接觸后,銻可以通過呼吸、飲食或皮膚接觸吸收等途徑進入人和動物體內[26],之后通過生物體循環系統分布在生物組織和體液中。植物對環境中銻的吸收、富集則主要依靠作物蒸騰作用產生的水動力推動水溶態的銻在植物體內的循環[27-28]。研究發現,銻在植物體內的形態取決于植物的種類和植物吸收積累的銻的形態[29-30]。相關研究表明,植物體內銻絕大部分是無機態,少量的有機態以二甲基銻為主,偶爾也會有一甲基銻[31]。
2 銻的形態分析技術
銻在環境介質中的遷移能力和生物有效性等特性與不同價態銻的賦存特征密切相關,因此,確定環境樣品中銻的形態十分重要。目前,對環境樣品中銻的形態分析研究仍集中于環境水體、礦區周邊土壤以及礦區礦渣等受人類活動影響較大且易于分析的環境介質,除此之外,近些年對銻的研究還拓展到了食品[32]、汽車制動粉塵[33]、藥物[34]等人類生活息息相關的領域。而水體沉積物、大氣環境、生活污水、汽車尾氣和道路揚塵等環境中銻的形態分析仍需進一步的研究。
2.1 樣品前處理技術
由于不同環境介質的物理化學性質不同,而且銻在各類環境介質和生物樣品中的含量很低,一般是痕量或超痕量,因此,在進行形態分析之前,選用合適的預處理方法對樣品進行富集并保證銻的形態不發生變化顯得尤為重要。萃取法因在預處理過程中可以保證環境樣品中銻元素價態的穩定性而得到廣泛的應用。不同環境介質中銻的預處理方法有所不同,目前主要聚焦于水環境中無機銻形態的分析,較為成熟且應用較多的萃取方法有固相萃取[35-38]、磁固相萃取[39-40]、固相微萃取[41-42]等。生物樣品基質復雜,單一的萃取步驟往往難以有效分離樣品中的痕量銻,因此不同萃取技術的結合是有效的處理方法[43]。對土壤、沉積物等固體樣品進行形態分析之前,微波消解是可靠的前處理技術[44]。從應用結果來看,現有的萃取應用通常只針對單一的銻形態,多種形態同時萃取的應用幾乎沒有。
2.2 形態分析方法
銻形態分析的檢測方法主要有原子吸收光譜法(AAS)、原子熒光光譜法(AFS)、電感耦合等離子體發射光譜法(ICP-OES)和電感耦合等離子體質譜法(ICP-MS)。此外,電化學分析方法由于成本低、環境友好等特性在元素檢測分析中受到廣泛關注[48]。近年來,高效的分離技術(例如流動注射分析(FIA)、離子色譜(IC)以及高效液相色譜(HPLC)等)與對元素進行特異性檢測的分析技術的聯用成為同時分析不同銻形態的熱門研究領域。
2.2.1 原子吸收光譜聯用技術
無論是AAS,還是原子發射光譜法(AES),均可利用銻的特征譜線(206.8 nm或217.6 nm)及譜線的強弱程度來定性定量測定銻[4],但靈敏度不高,而這也是光譜法測定銻檢出限偏高的根本原因。
石墨爐原子吸收光譜法(GF-AAS)適用于水中不同形態銻的檢測[49],但在分析復雜基質的樣品時,其分析靈敏度還是稍有欠缺[50]。氫化物發生(HG)技術由于實現了待測元素與基體的分離,從而減少或消除了基體的干擾,近些年受到研究者們的關注。氫化物發生原子吸收光譜法(HG-AAS)儀器操作簡單,維護成本低,而且對三價銻具有更高的檢測能力,可以區分三價銻和五價銻,用于銻形態的分析也是一大熱門,該分析方法在早期被用于測定大氣顆粒物[51]、人體肝組織和血液[52]中不同形態的無機銻,近年來則主要用于分析天然水體和飲用水中銻的形態。有研究者發現在HG-AAS之前增加基于固相萃取的在線流動注射(FIA)的預濃縮方法可以有效提高系統的靈敏性,用于測定環境樣品中痕量的無機銻離子[38]。
2.2.2 原子熒光光譜聯用技術
原子熒光光譜聯用技術(AFS)是通過測量待測元素的原子蒸氣在輻射能激發下產生的熒光強度來確定待測元素含量的一種方法。
AFS作為一種元素分析方法,需要與其他的分離手段聯用才能用于銻形態的分析。銻較易形成氣態氫化物,從而與樣品中雜質分離,減少復雜基質的干擾[4],因此,HG-AFS在測定Sb等可以形成氫化物的微量金屬元素方面具有很大的優勢,基于不同形態銻生成銻氫化物的時間不同,結合差減法可以有效地測定不同樣品中的無機銻[53-55],該方法測定銻具有較高的靈敏度和準確性,檢出限也比較低[56]。此外,HG-AFS與流動批次分析(FBA)[57]、多通道注射流動注射分析(MSFIA)[58-59]相結合,不僅可以測定無機銻的形態,還可以同時測定土壤樣品中的總銻和三甲基銻,與單獨的HG-AFS相比,應用范圍更廣,樣品損耗少,分析效率更高,但仍是使用差減法來對無機銻形態進行分析。
使用差減法進行銻形態分析時,往往需要較復雜的前處理操作,導致實驗結果誤差較大,HG-AFS與色譜法的聯用有效地改善了這一缺陷,通過調整流動相的種類和比例,可以在較短時間內實現不同形態銻的分離從而進行元素多形態的同時分析,分析效率更高。目前,液相色譜與原子熒光光譜法聯用技術因其操作簡單、準確度高、檢測限低而被廣泛的應用于測定環境樣品中的痕量銻。有研究者通過微波萃取結合HPLC與AFS實現了空氣懸浮顆粒物中的Sb(III)和Sb(V)的提取和檢測,可以很好地應用于大氣顆粒物中低至ng/m3范圍的銻的形態分析[60]。
2.2.3 電感耦合等離子體發射光譜聯用技術
ICP-OES在同時分析復雜基質中痕量金屬元素方面具有很大的優勢[61-64]。與AAS相似,電感耦合等離子體發射光譜法(ICP-OES)在銻形態分析方面的應用相對較少,大多需要與高效的前處理技術相結合來提高檢測的靈敏度。Jakavula等[65]選擇磁性離子印跡聚合物(MIIP)為吸附劑、超聲輔助磁固相萃取結合ICP-OES,成功地選擇性提取并分析了環境樣品中的痕量Sb(III),檢出限為0.13 μg/L。
近年來,AAS、AFS、ICP-OES等光譜技術在銻形態分析中的應用見表2。
2.2.4 電感耦合等離子體質譜聯用技術
ICP-MS具有線性范圍寬、穩定性好、靈敏度高、檢出限低、分析速度快等優點,因而在環境樣品中銻元素分析領域受到了越來越多的關注。ICP-MS作為靈敏的元素檢測方法,必須與分離手段聯用才能實現元素的形態分析,IC、HPLC等色譜分離技術根據不同元素或同一元素的不同價態與色譜柱的結合強弱的不同,選擇合適的洗脫液使目標物在不同的時間被洗脫下來進入檢測器進行分析。這些分離技術與ICP-MS的聯用使環境樣品中銻的形態分析取得長足的發展。目前,電感耦合等離子體質譜與色譜等分離技術的聯用在環境水樣中銻的形態分析已有很多研究[58,62,69-71],而環境空氣[72]、土壤[73]、沉積物[70-71]及生物樣品[74]中銻形態分析的研究相對較少。近年來電感耦合等離子體質譜法在銻形態分析中的應用見表3。
3 結論與展望
目前,重金屬環境污染物的形態分析仍是研究的熱點之一。銻因其潛在的毒性、致癌性等特點而受到廣泛的關注。從銻的形態分析的角度出發,高效液相色譜與電感耦合等離子體質譜聯用將成為未來銻形態分析的主要分析方法,聯用技術不但檢出限低、靈敏度高、穩定性好,而且能夠同時分離分析不同形態銻,適用于環境樣品中痕量銻的檢測。但現階段的研究仍集中在水環境樣品中,尚未在其他復雜基質中應用。未來需在以下兩個方面進一步研究,為復雜基質中銻的形態分析提供有效的分析方法。
(1)高效萃取方法的研究。各類環境介質的物理化學性質不同,決定了銻的存在形態不同,因此,在對銻進行形態分析時,針對復雜環境樣品,如土壤、沉積物等,如何同時高效萃取銻的不同形態,并保持萃取過程中銻各種形態的穩定性至關重要。未來應進一步加強對更高效、更專一的萃取程序的研究,提高銻的萃取效率,同時保證銻價態的穩定性。
(2)高性價比萃取材料的開發。固相萃取法操作簡單、萃取效率高、選擇性好,在痕量銻的富集分離中得到廣泛的應用。其中萃取劑的選擇和使用對于后續的分析影響巨大,未來應聚焦于研發萃取效率更高、價態結合更穩定、性價比更高的的萃取劑,以實現銻檢測分析技術的大范圍應用。
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