CINXE.COM

<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="390"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "publications.waset.org",cType: 'managed',cRay: '919c47530e91f900',cH: 'knJGN1omeQq5.JadfybxEC2kIkx1fLQoeGMTyDhbm4I-1740870111-1.2.1.1-PxbCNXHySyX_mkeRtz1dx2Qx12saDsv6kLoixSRKgXGBjwpf26sCR.X1h_2AJzB2',cUPMDTk: "\/abstracts\/search?q=Spectrophotometer&__cf_chl_tk=nhBMkl0PnggIqVG8ahnAhtoQaJWcQnzHzD8VnuASj0c-1740870111-1.0.1.1-tQdEaVffhlWuUr3HTNHogKgylGj4GB90AVUb5bAYgRk",cFPWv: 'b',cITimeS: '1740870111',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/search?q=Spectrophotometer&__cf_chl_f_tk=nhBMkl0PnggIqVG8ahnAhtoQaJWcQnzHzD8VnuASj0c-1740870111-1.0.1.1-tQdEaVffhlWuUr3HTNHogKgylGj4GB90AVUb5bAYgRk",md: "9kqH4EgQTPS0iVHrM1vou8aw83D8c2aoQ.SlhnfHUKA-1740870111-1.2.1.1-0sWeakhS116WBw.2CNLtwmxxnS8uC9IY06QmLc1oLx2hakkERUYFrvAzAjOwpunJebHpQpLJ_Db1UBQ7Bv94Hk9G.cl8k7Rodm9YDpVxUsnJfiK3LNAx_N7m1ZQXVkGktdfP_U5hgpDuMAQ.YxR0ZUqV_nFPiiirW0FYH8ZVmdTdZJVWK4cmIUM59q2D9TFy7rpbftfub34yXnrVZXN0RENUW52zrcBjnIMGeCUJo0hb3pyWtdOl0Y3hOabEpcRs4zzD3j_dosslZoKnUy9AtEaDv5XX59ud3rhvYna.5ZGyGh_UPGUjC8yL1Jk5zvL4ULMTtrWcMygbYj3DPqj51yruQLDS9rLmnn51RqdMXwyRMDV9zwutZJ1Xxb3HKif6o2kS9MhsvWWmKCtQVM7WJbqnRghtMgpYVnFqfdsb14XEz.vhJ_bIcPM44dSL3VaAacMCpCp8i7GWSTpJvYRhjR1TH7_UaBM2rdnAacHPXYS4Ym.JLy0ChxIH4BaEvm4JX8aXqWxuvNp1YsYkBVB6KQchKyJpiB38iQUMmVCrgkrkjKbKlktaQJutSYwbxMp_e9w3ViLWdoxtqpSA4mBT35mchzHxEAWCWbSbzKjlXkfKa_iP3eAnYUc_MnbWo230oH031RW6XKjVqCV8ikTza8T_UAB8cJNBReikItfolF.WARCoAGK7Ww8rKxK6A9jReO0VvxWG5NqbnD722Y.O8QjddwqDereUp1PloOavo497.1watQplNcCfkA3mWa1beNIw.5VbkmrxjN.ngs547a9gXHlXfat2Q.ftgCbAW_.SDEYAMKTK9REPm0jjwgYy3qW5ff3IHvzAqunP1N3w1aGZft9YetV6d_C9J8ghGbCKsppJxwgb.p3xdW2_cS1TPbYQjw5aMtatQK9oEKWGQ1e3307CrDtUKfJ48rAsGbeygn5bH0no1GJwj6KkBTsZ6LF4CGoA_O0BLunIcX4FG2a8.W7B2qvagMkRVUXOuPJCeS4mgHJauh.yzDQ7NqUTARapG1LrX9eiaw7dPPQvMMvgRyR3EfYRVI7dfwAr3rYzto6VJhmhi4GuCO.jv_t4T5xqL8pEYa1V1gjqgzMrn.dhy5CqXMaa34vTIQNWcfyNvW3kjAJrVulytwthm5rWv_W_TyJP82e3aCNit0lLEFsDO.FDCWbzNC75G.MXK9v0CVJbdJpa5A1U0pk_wpTydIYqdhan7cYP6zmudebCGOAWVTrBkeOwvFBm6Mx6G8_zQFmTDXQMWe3wtNTxL4tJIGyyo3ZA1dv6KKBVqoB.Xw",mdrd: "GPG9ULV2JL18Hk0HYVf5lDgiVMFX6Ziccv_u4nLRms4-1740870111-1.2.1.1-kX2CBtEIrK9Pk72spVAt2_Op8zK9xjFAXrbOlr0iNBbZaf74.JDyew8sPcOYwKrCt0u4KdEUO6vq7KKbDDwm4diSdW4ZuxqZTWdJbpujoPblH_oW5_ZGuHfddNpfZhNh8VJwuycNQLVLipTGJUxVBsvjNWMkxc6JJvKwH5d_y.C3ZmrhOg_mVCDFwmYyl7JLMfBun6At23sFTumF9iMGAPiDguGHw8RfwGXa4YTYm3i4KuiwQhEECB7d5F_qX5fJYykXZ65JUMouflhLILqlgMp_f3Ii4GKG.gTqNmNxE.Bn2GNxwuV8NsXg_6HUG5dY3AhuAzMEv1OIJpJVTGYS_DkwthCnVWmT5EcfazBuJ64RvOql1VKfpU7kqm6SUKcXQ3QRD1pAdN4l.jy2oysYoRSVt_ki4fZlQlo23S60kTj8zrxrlEzHOTLZErsjr4aA0Sto43eh245QL2GIEyPSx_gy4e4M4jtCpPW6.pHxZPcNaLMCeQT6w.K4oFqJIDYGS1oXr7AoKLOAU4GeN83x22JZIk1POuO1klvdwhJVXl84uBluTaOLGEsh4Frz6oD0v4mBqVbHOU2dY2mvfRueGcJ6ovfNhSx9GNiENKpiY6gHoQBdq734uca8xKlbtU_hhqhRBqoWAoJOe2HEDKLfJqFC4xvCL_KaE6ttKFRjxDTqtWcLhOD35k7UXDplDF8Z47Rcy6Fh0yo5iAZSoCZz3EApkQrNm2SGeFGPluLDUocncIleQpheL.ilzYH6u6ueY5N8t6wxfLf17D7JRTPuly2Ito.Fbb37V4WA.hvRhx0OwUwVY.FcPKYjIfgwLZvNCduHxegZfCc0FNG79lAWON3sA_VeAHaxpXhd1gk6O4SVVT35S7cPuDJlUSPvl2lyB0z0YcxYx7zKaV6vEWTUP__rZipBdtUzGrYKS.tvmDkalsT9MAuVlLygfJaPPl0FTeHt1scMalv1kv1izuVTPeGB4frXV2jCqFZkvYA5_mi7BbPBoctNubY1wvsdY9eJm93Uh.LOtnsfizanCaD0ZvhQI6X.w7PF4pLbVdCI1gbM0b3exM7ATuQ522Ph6S.7HrQpK3cDQpajMBEP5UImfZjaVnCnoS9_gc0.SyqYhBr8EfqvV2Mc_j.5Tc1f9xKhKYQZp7kXvbucE_s4JL.QAADFjl6vlsZXOXkGsIaNanU_b7iLpICZiOgn.Vgm87fiNUekXoQth60JL1vBsB_enuPbjn8owtH4FxdVKGifMGKMrSbfqMV1d0tvdY47YUhyfoQYxHlNJNiHYrLIqboyGRx0fYIkur66pOrw9N5wl_htCsiLSmM3Vu2X7MKtQv9PnQY_yHLLSR7GCmi6GJa2blMDHyM2p5lTDt.bf.ayDykLkSCkMdAwDnThoi694BWfkPmvmbxo3FHLaKKdiGzAJvLXWEaXmcT1zDKTpsrSVlgavdS08v_c1iyLda.usGfHO32X9oUopOhKUpZ_s0yxt1RBdZ7O4uSI.Af_6ZUFCwrGsDVnIVzSi.DQsIzyFGCGCKBwYg_E507cDh95mzIrWFK6ZRD6qUR0.1NG24Y5NkrXDoGBXJ6O0FbSXrKodcUDB9yccE7zUftlUZpeBsBj4RqOza1uRN0iZxRabzvwj9zoHJAkpZ3ctM8AqBRUFpU1GmZnmeumrGNf8xQB7iCgClKnnnTIEJhRYMGL9aqH5sNjYOvyuT2AdwiT3DzVymuWQoH6FkJJwUSWAdCd.V_0c9PbkvCkxdupzE15.k91YX4gAAuWci.Jw6cEWo6UFfvPYnZ_SlCEG0iwgLwNQTxX0yzykZjpT53D3XvXsViaXUhMjG2uaVYJE_Ts21G7Cegiy1GkYi.bGLWhSZthJ8tuwc.wLLSUDFCo0BvExo.24kLpD.Ar4.TmK9zXUTH9AKeqbwMCawmWU1YXuwaLWH9x_OcaGHPg6FmbfAho1jvEiPAu8G2rLaGZkTK8mu6EYU5q"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=919c47530e91f900';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/abstracts\/search?q=Spectrophotometer&__cf_chl_rt_tk=nhBMkl0PnggIqVG8ahnAhtoQaJWcQnzHzD8VnuASj0c-1740870111-1.0.1.1-tQdEaVffhlWuUr3HTNHogKgylGj4GB90AVUb5bAYgRk" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>