JP2011117728A - Method of detecting harmful substance to environment, detector, and detection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To identify environmental pollutants contained in wood and to determine the quantities thereof. <P>SOLUTION: By applying laser light to wood that threatens to contain chemicals or metals harmful to environments, the surface of the wood is turned into plasma. Light (fluorescence, phosphorescence, etc.) coming out therefrom is condensed and analyzed through spectroscopic analysis to detect substances such as chromium and arsenic that threaten to adversely affect the environments. This allows waste wood containing harmful substances to be properly determined, allowing the waste wood to be assorted, and then, recycled, rejected, or treated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a detection method, a detection apparatus, and a detection system for harmful substances to the environment. More specifically, the present invention relates to a method, a detection apparatus, and a detection system for accurately detecting harmful substances that adversely affect the environment such as chromium and arsenic contained in wood.

CCA (chrome, copper, arsenic) -treated wood is obtained by pressurizing a CCA agent into wood. Although it has an excellent antiseptic effect, there are concerns that arsenic vaporizes and scatters when CCA-treated wood is discarded and disposed of, and that chrome remains in the incineration ash, which may adversely affect humans and the environment.
Therefore, when discarding wood, it is necessary to detect whether the wood has been subjected to CCA treatment, and it is necessary to sort and discard it.

  The detection devices that have been developed so far have insufficient accuracy, are large and difficult to use, and are difficult to use in the field, such as radiation. Therefore, an accurate and small CCA detection device, system, method and the like have been demanded. In addition to CCA, there are woods that contain metals that are harmful to the human body and the environment, so detection devices, systems, methods, and the like for detecting them are required.

  A simple device is currently available on the market, but this is not accurate, and there are problems such as making positive determinations other than CCA-containing wood and making mistakes in determining CCA-containing wood negative.

  If these problems can be resolved, CCA-treated wood can be accurately and easily identified, so it is expected that waste wood that adversely affects the environment will be separated and wood recycling can be optimized. Development of detection devices, systems, and detection methods has been desired.

Toshiyuki Sato, Takehiro Kanai, Norio Ando, Masao Kobayashi: Development of optical wood preservative detection method, Yamagata Industrial Technology Center report, NO34, p.5-8, 2002

  The problem to be solved is to identify wood that contains harmful drugs. That is, the present invention provides a detection apparatus, system, and method that can accurately detect harmful substances in wood, particularly harmful metals such as chromium and arsenic.

  In order to solve the above-mentioned problem, the present invention generates plasma by irradiating wood with a laser (sometimes referred to as “laser”, but the meaning is exactly the same), and then measures fluorescence. The main feature is to measure the content of chromium, arsenic, and copper and to determine whether the wood is CCA-treated wood based on the content.

In the present specification, the following inventions are provided.
(1) An environmental hazardous substance measuring system having a laser irradiation unit, a condensing unit, a unit that transmits laser light and reflects fluorescence, and a spectroscopic analysis unit is provided. According to the present invention, the laser beam is focused by the laser irradiation unit and the condensing unit to irradiate the wood with the laser, and the fluorescence emitted from the irradiated part is reflected and collected in the second condensing unit. An effect is obtained that fluorescence intensity can be measured by inducing fluorescence.

(2) The environmental hazardous substance measuring system according to (1) having two or more condensing means (3) The environmental hazardous substance measuring system according to (1) wherein the condensing means is a condensing lens

(4) The environmental hazardous substance measuring system according to (3), wherein the focal length of the condensing lens and the spectral analysis means are the focal length or a distance farther than the focal length.

(5) The environmental hazardous substance measuring system according to (1), wherein the means for allowing the laser beam to pass is a mirror with a hole.

(6) The environmental hazardous substance measuring system according to (5), wherein the hole diameter of the mirror with holes is 1 mm to 15 mm. More preferably, it may be 3 mm or more.
(7) Environmental hazardous substance measurement system according to (1) to (6), wherein the environmental hazardous substance is chromium, copper, or arsenic. (8) Environmental hazardous substance measurement system according to (1) to (7), further comprising data analysis means.

(9) There is provided an environmental hazardous substance detection method comprising a step of irradiating a wood with a laser, a step of condensing the fluorescence from the irradiated region, and spectroscopic analysis of the collected fluorescence.
(10) Further, the method for detecting environmental hazardous substances according to (9), wherein data is analyzed to determine whether or not it contains environmental hazardous substances

(11) The environmental hazardous substance is chromium, copper, or arsenic (9) or (10) the environmental substance detection method (12) having a step of reflecting the fluorescent light from the laser irradiation site before condensing (9) Or (11) environmental hazardous substance detection method

(13) An environmental hazardous substance measuring system having a laser irradiation unit, a condensing unit, and a spectroscopic analysis unit is provided.

    In the present invention, there is an advantage that chromium, arsenic and the like can be detected by irradiating wood with laser light to bring the surface into a plasma state and analyzing the fluorescence emitted therefrom.

FIG. 1 is a diagram showing a direct condensing system. (Examples 2, 3, 4, 5) FIG. 2 is a diagram showing the position adjustment of the spectroscope in the direct focusing system. (Examples 2, 3, 4, 5) FIG. 3 is a diagram showing the light collecting system after improvement. (Examples 2, 3, 4, 5) FIG. 4 is an explanatory view showing a condensing method such as fluorescence of the condensing system after improvement. (Examples 2, 3, 4, 5) FIG. 5 is a graph showing the spectrum (PT) before and after optical system improvement. Example 3 FIG. 6 is a graph showing the spectrum (PT) after data processing. Example 3 FIG. 7 is a graph showing spectra (various samples excluding unknown) before data processing. (Example 4) FIG. 8 is a graph showing spectra after data processing (various samples except unknown). (Example 4) FIG. 9 is a graph showing the peak of As detected from CCA-treated wood. (Example 5) FIG. 10 is a graph showing spectra (As peak detection wavelength range) other than CCA-treated wood. (Example 5) FIG. 11 is a graph showing the peak of Cr detected from CCA-treated wood. (Example 5) FIG. 12 is a graph showing spectra (Cr peak detection wavelength region) other than CCA-treated wood. (Example 5) FIG. 13 is a scatter diagram of the relative light emission intensity after the optical system improvement. (Example 4)

  According to the present invention, there is provided a CCA wood determination system including a laser irradiation unit, a condensing unit, a unit that transmits laser light and reflects fluorescence, a spectral analysis unit, and an analysis unit. The laser irradiation apparatus is not particularly limited as long as it can oscillate a laser having a certain level or higher intensity. The intensity above a certain level refers to an intensity higher than the intensity at which plasma can be generated when wood is irradiated. A YAG laser is most preferably used, but is not particularly limited as long as it can be used for the above purpose. An example of the YAG laser includes, but is not limited to, a Q switch Nd: YAG laser Tempest 10 (New Wave Research).

  Typically, a condensing lens, a concave mirror, or the like is used as the condensing means, but is not limited thereto. The laser emitted from the laser irradiation means is collected by a condensing lens and focused on the surface of the wood, so that the surface of the wood is turned into plasma and emitted light (fluorescence, phosphorescence, etc.) when returning from the excited state to the ground state. The light is guided to the second light collecting means by the reflecting means, condensed and guided to the spectroscope.

  “Let the laser beam pass” means that the laser beam is passed through the reflector in order to apply it to the surface of the wood opposite to the laser light source of the reflector. It may be one that reflects half and allows almost half to pass, or a hole that is large enough to allow the laser to pass through it may be drilled inside (a multi-layer flat mirror with a hole). The size of the hole depends on how much the laser beam is reduced when passing through the laser, but it may be 3 mm to 20 mm, more preferably 5 mm to 15 mm. However, in short, it may be larger than the beam diameter of the laser to be irradiated. . The term “larger” means that the laser beam is large enough not to hit the mirror and emit an interference wave.

  “Reflect the fluorescence” means that the fluorescence emitted when the laser is applied to the surface of the wood is reflected so as to be collected in the second light collecting means. Thereby, the advancing direction of fluorescence can be changed to the direction of a condensing means. In order to reflect, an agent that efficiently reflects a target wavelength may be coded.

  A condensing lens is preferably used as the second light condensing means. In the case of the present invention, the focal length of the condenser lens and the position of the spectroscope do not necessarily match. Regardless of the focal length of the condenser lens, it may be moved back and forth to determine the distance at which a better spectral analysis result can be obtained.

  A spectroscopic analyzer can be used as long as it has a measurement wavelength range of 190 nm to 300 nm and a resolution smaller than 0.15 nm. For example, EPP2000HR manufactured by StellarNet can be suitably used, but is not limited thereto.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not limited to these.

Test Material In this example, 31 kinds of test wood shown in Table 1 were used. The abbreviation legend is shown in Table 2.
Test wood

Abbreviation for drug or wood

CJ1 in the sample was a waste material from the site of the water leakage complaint and was wet when the sample arrived. For this reason, the experiment for CJ1 was naturally dried and irradiated when the surface condition of the wood was the same as that of the other samples.
Table 3 shows the CCA numbers for companies that provide each specimen wood and the companies that provided CCA-treated wood, if known.
Types of timber suppliers and CCA chemicals

Equipment used Optical system
The parts of the optical system are shown below as equipment constituting LIBS.
a) An EO / Q-switched Nd: YAG laser (NEW WAVE RESEARCH, Tempest 10) was used as the laser as the laser excitation source. YAG laser is a small housing and has the feature of emitting short pulses and high power beams. Table 4 shows the specifications of the laser.
Laser specifications

b) Laser light Condensation lens The plano-convex lens with a focal length of 150 mm (Sigma Kogyo Co., Ltd.) is used as a condensing lens to irradiate the sample wood with laser light at an energy density sufficient to make the surface into plasma. Manufactured by SLB-25-150P).

c) Spectrometer (spectrometer / detector)
As a spectrometer (hereinafter referred to as a spectroscope), EPP2000HR (specification: Table 6) manufactured by StellarNet having a measurement wavelength range of 190 to 300 nm and a resolution of 0.15 nm was used. The dispersive element of this spectroscope is a diffraction grating, and the internal optical arrangement is a Cernitana type. When connected to a computer, the wavelength and intensity of the obtained light can be displayed as a spectrum.
A quartz collimator lens was attached in front of the entrance slit of the spectroscope, and the light collected on this lens was used in the form of entering the spectroscopic section.
Lasers and spectrometers are available from Avantes, AvaSpec-2048 Fiber Optic
Spectrometer was connected as a terminal with a cable and used in synchronization.
Spectrometer specifications

d) Other experimental conditions Regarding the setting of the laser and the spectroscope, the experiment was performed with the exposure time of the spectroscope being 30 ms and the delay time of the laser and the spectroscope being 0 ms (Table 7). The exposure time represents the time during which the spectroscope performs measurement, and 30 ms, which is the shortest exposure time in the spectroscope used in this experiment, was used. The delay time refers to the time from the start of the laser until the spectroscope starts measurement. When the delay time is set, measurement can be performed while avoiding plasma bremsstrahlung. In this experiment, the delay time could not be set in the spectrometer, so the experiment was conducted in the state where the start of the laser and the measurement start of the spectrometer started simultaneously.
Laser irradiation conditions and spectrometer measurement conditions

The experiment was conducted while evacuating the sample in a wooden cover in order to turn the sample containing toxic elements such as Cr and As into plasma.
The experiment of the following example was conducted on the above conditions.

Concentration optical system for plasma emission The test wood was placed at an angle to the laser, and the instrument configuration was such that plasma emission was detected directly with a spectroscope (Fig. 1). This equipment configuration was devised for the purpose of constructing the simplest and most economical system when using a CCA-treated wood discriminating device in the field.
In this direct condensing system, an optimum spectrum is obtained by finely adjusting the angle of the wood and the positional relationship with the spectroscope as shown in FIG. Specifically, it was set so that the rise in the baseline was suppressed, and the peak intensity of the element could be measured at a constant intensity or discriminable level. Further, the irradiation was performed in a state where the phenomenon of saturation exceeding the measurable intensity of the spectroscope and causing the spectrum to be compared was not caused as much as possible.

On the other hand, we tried to further improve the optical system for the purpose of detecting the peak of As, which was difficult to detect, to the extent that it can be discriminated, and measuring a spectrum that was stable to some extent after the second (second). . FIG. 3 shows the equipment layout after the optical system improvement.
The plano-convex lens that condenses the laser light with this optical system is the same as the direct condensing system, but plasma from 225 to 270 nm in the wavelength range including carbon derived from wood and As and Cr peaks peculiar to CCA-treated wood. In order to reflect the light emission efficiently, it was reflected by a 45 ° tilted multi-layered flat mirror (manufactured by Sigma Koki Co., Ltd., TFM-30C05-248-KH05-45, hereinafter a mirror with a hole) and a mirror with a hole. A plano-convex lens (SLSQ-30-40P, manufactured by Sigma Koki Co., Ltd.) with a focal length of 40 mm was newly arranged to collect the plasma emission and send it to the spectrometer. A combination of these two new optical devices and a plano-convex lens for laser focusing is placed on the top plate (Sigma Optical Co., Ltd., OBB-1216), and this is used as an improved optical system unit. It was used for.

After the optical system was improved, the specimen wood was always placed at a right angle to the laser, so there was no need to adjust the wood angle. However, although the focal length of the plasma emission condensing lens is 40 mm, only a weak peak can be measured at 40 mm in the actual measurement. When the distance between the collimator lens and the plasma emission condensing lens is 50 mm, the peak intensity is the optical system. Since it was obtained to the same extent as before the improvement, the experiment after the improvement of the optical system was carried out by placing a spectroscope at this distance. FIG. 4 shows the positional relationship between devices.
Each experiment was carried out with the above equipment arrangement and settings.

  The 193.20 nm, 229.96 nm, and 247.96 nm peaks were previously detected as wood-derived carbon peaks. However, the reflectivity of the mirror with a hole used after the optical system improvement is close to 100% between wavelengths 225 to 270 nm, and the two carbon peaks in this range are 229.96 nm and 247.96 nm. These element peaks were identified by the element emission wavelength table of the National Institute of Standards and Technology (NIST).

Similar waveforms and carbon peaks were detected before and after the improvement of the optical system. From this, it is considered that the measurement by LIBS can cope with various optical system settings, and that it is possible to detect stable element peaks regardless of the condition settings of the optical system and the like.
Regarding carbon, two peaks at 229.96 nm and 247.96 nm were detected with an intensity that is almost the same as that of the first time up to about 50 irradiations before the improvement of the optical system. This is the same after improvement of the optical system, and the same peak as the first time can be obtained even after irradiation of the same spot 100 times or more. Therefore, it is considered possible to obtain a more stable spectrum than before the improvement of the optical system. The reason for this is that the sample was placed obliquely with respect to the spectroscope before the improvement of the optical system, so that the directivity of the plasma was hindered by the oblique holes caused by multiple irradiations to the same location, whereas the optical system After the improvement, the holes generated by laser irradiation are also perpendicular to the sample, so the directivity limit is considered to be smaller than before the optical system improvement. Furthermore, since the plasma emission is reflected by the mirror and then sent to the spectroscope, the plasma emission can be collected in a wider range than before the optical system is improved. These two effects are thought to have led to a more stable spectrum than before the improvement of the optical system.

  For target elements such as As and Cr, the peak tended to decrease with each irradiation, regardless of the optical system improvement. However, this peak intensity attenuation was more gradual after the optical system improvement. This is also considered to be due to the same reason.

  There was also a difference in peak value deviation. In the direct condensing system, multiple times of irradiation to the same location are not performed unless saturation occurs. Basically, the first spectrum is used as data, and 10 samples are averaged and one sample is averaged. It was a spectrum. Even with the improved light collection system, data for 10 locations were collected, and the deviation of the peak values of target elements such as wood-derived carbon, As, and Cr was about one-third that before the optical system improvement. It is considered that this reason is also due to the fact that the above stable spectrum is obtained. For this reason, the experiment before the improvement of the optical system was performed as before, but after the improvement of the optical system, the 2nd to 5th irradiations at the same location were used, and this was performed for 3 locations, and one sample was averaged. The spectrum was used.

  The reason for the second to fifth irradiation is that the reference carbon peak 247.96 nm was not detected at a certain intensity or more in the first irradiation due to foreign matter on the surface. Before the improvement of the optical system, the peak intensity at 247.96 nm was normalized as 1500, and the spectra of all samples were relatively evaluated. Since the peak value of carbon 247.96nm was almost the same before and after the optical system improvement, the data of 247.96nm peak intensity exceeding 1000 was taken from the 2nd to 5th time, and this was averaged for 3 locations and spectralized. . As a result, it is considered that the treatment chemical can be accurately identified while avoiding the influence of the surface foreign matter even in the waste material.

Examination of experimental conditions Based on the above, the experimental conditions in this experiment were examined.
Before the optical system improvement, the baseline was almost constant at 500, so the baseline was not corrected, and the spectrum was compared by normalizing the peak value of carbon 247.96 nm to 1500. However, after the improvement of the optical system, the baseline tended to shift slightly compared to before the improvement (FIG. 6). For this reason, the minimum value in the 1 nm interval was calculated while shifting every reading (0.05 nm), and the result obtained by connecting these values was taken as the baseline. Baseline correction was performed by subtracting this baseline value from the raw data. In addition, normalization was performed to compare the spectra between samples, but the intensity from the baseline of carbon 247.96 nm was about 1000, unchanged before and after the optical system improvement. (FIG. 8).

Since the peaks in the spectrum were more stable after the improvement of the optical system, all of the subsequent spectra use data after the improvement of the optical system. In addition, when discriminating CCA-treated wood, a scatter diagram was prepared at the peak intensity of As and Cr (FIG. 13). Whether or not it is CCA can be determined by creating such a scatter diagram and determining an appropriate threshold. Here, the comparison before and after the improvement of the optical system is performed, but when making a scatter diagram, the baseline correction and normalization similar to those after the improvement of the optical system are performed on the data before the optical system improvement. Table 7 on the next page summarizes the differences between before and after the improvement of the optical system, and the data processing in this experiment.
Differences before and after optical system improvement, data processing method in this experiment

Qualitative analysis by direct irradiation of test materials-purpose and method
For the purpose of developing a method that can accurately identify CCA-treated wood in the field, we measured the spectrum based on the conditions studied in the previous section and examined the indicators for CCA-treated wood. All obtained spectra were baseline corrected and then normalized and compared and analyzed. In this experiment, all laser irradiation was performed on the preservative surface of the test material. For those using a pressure injection method such as CCA, the injection was performed on a portion where sufficient drug injection was confirmed by visual inspection of the mouth end.

From the results of qualitative analysis by laser-induced breakdown spectroscopy (LIBS), it was found that a peak effective for discrimination of CCA-treated wood exists between 225 and 270 nm. As is 228.89 nm for Cr and 266 to 268 nm for Cr (Cr is characterized by three consecutive peaks in the short wavelength section), of which 267.83 nm has the strongest peak. Furthermore, the carbon peaks 229.66nm and 247.96nm mentioned above are also in this section. For this reason, all spectrum comparisons were made within this wavelength interval. The peak of Cu, which is a constituent component of CCA, has been found in the experiment at 213 to 225 nm, but wood preservatives other than CCA such as ACQ and CUAZ also contain Cu, and thus are not suitable for discrimination.

The peak of As was slightly different in peak value depending on the irradiated part, but no significant difference was observed after data processing (As
About 60-170 at 228.89nm peak value. 10 and 11). CCA-treated wood samples include unused wood and waste wood (aged 10-30 years), but there was no correlation between age and relative luminescence intensity. The peak at As 235.01nm was also observed, but this time it was not included because there was a peak detected in non-CCA treated wood.

  A Cr peak was also observed. When the CCA-treated wood was discriminated at the peak of Cr 267.83 nm, it could be discriminated without erroneous judgment. As shown in FIG. 12, the spectrum in the same wavelength range measured except for CCA-treated wood is 100 or less at the maximum. On the other hand, the spectrum from CCA-treated wood shows at least 300 or more (FIG. 11).

  In addition, the peak value of each element measured in this experiment was slightly different from the above-mentioned literature values. Specifically, it was observed shifted from 0 to 0.12 nm shorter wavelength than the literature value. In addition, among the samples whose processing was unknown, there was a case where a Cr peak was observed on the irradiated surface for XC1. Hereinafter, for XC1, XC1-a indicates that the Cr peak was not observed by irradiation, and XC1-b indicates that it was observed.

Qualitative analysis result by fluorescent X-ray analysis Since there was no analysis result other than LIBS, the sample was subjected to qualitative analysis by fluorescent X-ray analysis. X-ray fluorescence analysis (hereinafter referred to as XRF) is an analysis method in which fluorescent X-rays generated by irradiating a sample with X-rays are dispersed, detected, and counted. Fluorescent X-rays are X-rays that are emitted when outer-shell electrons transition to vacancies that are generated when inner-shell electrons are excited by irradiated X-rays. Elements are identified by this fluorescent X-ray. Is XRF. Features include the ability to perform multi-element simultaneous analysis quickly, the ability to perform non-destructive specimens, and the absence of chemical pretreatment of the specimen. Comparing the differences between ICP and XRF, ICP is more advantageous for quantifying ultra-trace elements, but XRF has higher overall accuracy.

  The instrument used for the qualitative analysis by XRF is a fluorescent X-ray analyzer RIX3000 (Rigaku Corporation). In this instrument, a sampler is filled with a sample, and irradiation is performed under reduced pressure in an X-ray controlled area. For this reason, each sample was prepared in a 3.5 mm square and a thickness of about 5 mm, and was subjected to an experiment after being completely dried. All the pieces of wood were collected from the drug-treated surface.

As a result of qualitative analysis by XRF, it was confirmed that CCA-treated wood, that is, CC1, CJ1, and CT1 to 11 all contain As and Cr. In addition, among the untreated wood, XT1 was detected with X-ray intensity that Cr and As are considered to be treated with chemicals. It is thought that As and Cr were treated with chemicals from non-CCA treated wood. None were detected by intensity. In addition, among the XT1 whose strength of As and Cr was the highest among those identified as CCA-treated wood by XRF, the back side was also measured (this is referred to as XT1back). Table 8 shows the X-ray intensity of Cr, Cu and As in each sample. (ND stands for Not Detected)
Qualitative analysis results by X-ray fluorescence analysis

Results of qualitative analysis using a comparative commercial apparatus There is a Wood scan (Highwood Co., Ltd.) ²³⁾ which distinguishes CCA from a near-infrared absorption spectrum as a CCA-treated wood discrimination apparatus mentioned in the introduction. In this experiment, in addition to LIBS and XRF, this Wood
CCA qualitative discrimination was compared based on the results of scan. In addition, all qualitative analyzes by Wood scan were performed on the same surface as LIBS and XRF.

In Wood scan, the measurement part was pressed against the wood according to the attached instructions, and CCA was determined by averaging the measured values at three locations. It is set to be determined as CCA if the value obtained during measurement is above a certain level. In the judgment by Wood scan, if the value is above a certain value, it is judged that it is BAD, that is, CCA-treated wood, otherwise it is GOOD and non-CCA.
In this device, copper-based drugs other than CCA, ACQ, and CUAZ may also be judged as BAD, and there is a problem in accuracy. In addition to this, creosote oil, which was a typical wood preservative before CCA, is determined to be BAD. In addition, it cannot be determined that the wood surface has been painted or has significant dirt, so that it cannot fully meet the practicality in the field. Table 9 shows the judgment results by Wood scan as GOOD (non-CCA) and BAD (CCA).
CCA treated wood judgment result by Wood scan

 As a result of both X-ray fluorescence and wood scan analysis, no X-ray analysis detected As or Cr from CCA-treated wood. However, the wood scan results showed that all wood treated with ACQ and CUAZ was BAD, that is, CCA-treated wood. Conversely, CT1 and CT3 that were treated with CCA were judged as GOOD, and even though CCA was treated, they were judged as non-CCA treated wood.

  The present invention can be used for a recycling business of waste wood from a house or the like.

Claims (12)

An environmental hazardous substance measuring system comprising: a laser irradiation means; a light collecting means; a means for allowing laser light to pass through and reflecting fluorescence; and a spectroscopic analysis means. The environmental hazardous substance measuring system according to claim 1, wherein the light collecting means is two or more. The environmental hazardous substance measuring system according to claim 1 or 2, wherein the condensing means is a condensing lens. The environmental hazardous substance measuring system according to any one of claims 1 to 3, wherein a distance between the focal length of the condenser lens and the spectroscopic analysis means is a focal length or a distance farther than the focal length. The environmental hazardous substance measuring system according to any one of claims 1 to 4, wherein the means for allowing the laser beam to pass is a mirror with a hole. 6. The environmental hazardous substance measuring system according to claim 5, wherein the diameter of the hole of the mirror with a hole is 1 mm to 15 mm. The environmental hazardous substance measuring system according to any one of claims 1 to 6, wherein the environmental hazardous substance is chromium, copper, or arsenic. The environmental hazardous substance measuring system according to any one of claims 1 to 7, further comprising data analysis means. Provided is a method for detecting an environmental hazardous substance comprising a step of irradiating a wood with a laser, a step of condensing the fluorescence from the irradiated site, and spectroscopic analysis of the collected fluorescence. Furthermore, the environmental hazardous substance detection method of Claim 9 which analyzes data and determines whether an environmental hazardous substance is included. The environmental hazardous substance detection method according to claim 9 or 10, wherein the environmental hazardous substance is chromium, copper, or arsenic. The method for detecting an environmentally hazardous substance according to any one of claims 9 to 11, further comprising a step of reflecting fluorescence from the laser irradiation site before condensing.